Reddit reviews ChromaHarp 21 Chord Auto Harp

Picked up one of these at Goodwill recently for $7. However, I'm not sure what model it is, as there are apparently multiple ones that look similar, but mine doesn't seem to have a model number anywhere. I'll more than likely be sticking to ebay, as the condition isn't fantastic and I've never sold on Amazon before. It also comes with a suitcase-like case. Anyone have an idea of how to identify the model?

I don't think I'll have too much trouble actually finding a buyer, as it seems to sell well on eBay. My problem is I'm having trouble finding a box to ship it in. The dimensions of it are approx. 24"x13"x4". I have a box that it fits in, but its height is like twice the necessary size and will most likely increase the shipping cost by a lot for that reason alone. The case seems sturdy, and I have some brown packing paper lying around. If I just wrap the instrument in bubble wrap, put it in the case, and maybe put a layer of bubble wrap around the case, and wrap the case with the packing paper, would that be okay? Or is it too risky?