Here's what we did to store our TI4 in the box. I stole the idea from user bigegg on the bgg forums in this thread--

https://boardgamegeek.com/thread/1885145/storage-solution-box

Some of his details are incorrect and he has no references for what he actually used or bought, so that's what I'm doing here.

Ground force tokens, trade good tokens, and other misc things go in one of these: (EDIT: we clipped off the little hanger thing on the end because it made the box just barely not fit) https://www.amazon.com/gp/product/B000E39T4Q/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Action card deck and Agenda deck each gets one of these https://www.amazon.com/gp/product/B0002TT3KW/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Seventeen of these for the race tokens and cards, one for the planet deck, and one for the objective deck, for a total of nineteen:
https://www.amazon.com/gp/product/B0002TT3KM/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1

Lastly, these six boxes are for the ships and the colored cards--the tech decks and promissory notes: https://www.amazon.com/gp/product/B00K2DREPO/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1

Everything all together was around $50.

We cut the planet tray out of the rest of the tray with a box knife, and we put the strategy cards atop one of the stacks of planets. The victory track we ended up moving to the top of the race boxes so it would lay flat. Other than that, the books and stuff sit on top of everything, and the box closes up no problem. It's considerably heavier than before due to all the added plastic, of course, but it's looking like cleanup and set up will be much easier with this method because all anybody will need to grab is their color box and their race box. Hope this helps!

Edit: Ah also forgot to mention--we sleeved everything in these. They are thinner than the FFG ones and therefore fit in our plastic cases:
https://www.amazon.com/Mayday-Games-Sleeves-41x63mm-sleeves/dp/B06XZGN51N/ref=sr_1_4?ie=UTF8&qid=1511979051&sr=8-4&keywords=mini+card+sleeves

Most of my suggestions are from other Reddit posts on here or BGG.

Do yourself a favor and buy an accordion/file folder for the map pieces, ideally with at least 13 pockets for map pieces A-M. That way you do not need to Tetris the pieces back in the box. Saves a lot of time.

I use this Plano box for commonly used small pieces.

And this one for the environment and monster holders.

Smaller monsters will fit in a tray like this one but not the larger mobs (or ones with ten of them), so you would either need to baggy those mobs anyway or cut space in the included foamcore packaging (there are some good examples in other threads).

Also YMMV, but we keep "trashed" cards in a separate ziploc bag rather than actually destroying them.

Edit Note: Using all of the methods described above, I can fit everything from the 1st edition in the box except the file folder.

Here are some links for the product in the above comment for different countries:

Link: http://www.amazon.com/gp/product/B000E39T4Q/


|Country|Link|
|:-----------|:------------|
|UK|amazon.co.uk|
|France|amazon.fr|
|Germany|amazon.de|
|Japan|amazon.co.jp|
|Canada|amazon.ca|



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Never tried but I bet the clear plastic organizers for fishing lures would work great.
Edit: like this http://www.amazon.com/gp/aw/d/B000E39T4Q/ref=mp_s_a_1_2?qid=1427844199&sr=8-2&keywords=Plano

This is what I use for pretty much all my FFG games. It doesn't look like the image on the page, if you scroll down to the first review (where they're storing 7 Wonders tokens in it), it looks like that. It's great for Legion because one of the wide sections without any dividers in it holds the movement tools and the four range ruler pieces, while all the tokens fit in the other two rows easily.

http://www.amazon.com/gp/product/B000E39T4Q/ will hold all the tech squares, and can be passed around the table as needed.

Links to materials:

• Plano 2-3700: amazon ~$9.08
  
• Feldherr FS010B: amazon (5pcs) ~$15.99, amazon (10pcs) ~$16.99
  
  

  About the container:
  

  
  Using a fishing stowaway tackle box and some foam, it's really easy to make a neat little container to hold all your TTRPG stuff. You can stack more or less layers of foam inside divisions to make it easier to reach (the potions have 3 layers) or to make more room for bigger things (the d20s only have 1 layer). Half-divisions hold standard 1-inch base miniatures perfectly (the fairy lady is a metal mini printed off Hero Forge).
  
  The tackle box used is one of the larger sizes Plano has to offer, but if you don't have as much stuff to stash, the Plano Prolatch 3600 or the Plano Prolatch 3500 are smaller options that also work great. These sizes are better for players who want a case like this or DMs with nothing else but a couple dice sets and some minis.
  
  Keep in mind that there will be a lot of foam left over. The 2-3700 only required two or three sheets of foam to triple-stack the entire container, and I got myself a 10-pack. If you need to get rid of the extra foam, getting a couple 3500's for your players is a nice gift, considering they only run about $4 each. I got a four-pack of the 2-3700's since most of my players also DM, so hopefully that uses up the rest of the 10-pack of foam.

My Scenario & Encounter cards are sleeved in a BCW Deckbox. I also have a Dual Deckbox that I can hold the 3 pre-built core decks in. Tokens are held in a Plano 3500

I picked up this plano for it, fits all the workers + gears + citizens. I leave the goods in a baggie so I can just dump them on the map randomly, and left the buildings together with the round tracker tiles in a baggie. I should note I use the cardboard gears and citizens, I don't like the plain wooden ones for those.

I use a lowepro camera case large enough to hold the camera housing a box similar to this for all my parts. I have one large enough to hold all my junk, even my mini tripod and cords. When I'm lazy I'll just attach my suction cup mount.

edit link

I got the 3500 from amazon here: Plano 23500-00 Size Stowaway with Adjustable Dividers https://www.amazon.com/dp/B000E39T4Q/ref=cm_sw_r_cp_api_5jBTybCG28CN8

As for the 3600, I got it from my local Walmart in the fishing section. I checked amazon quickly and didn't spot the one I have on there. Sorry couldn't be more help!