Need some advice

Ok so my husband has his POP collection and he has over 300 if I remember correctly. My question is, I read somewhere that some people collapse the POP boxes so they are flat, if you choose to display out of the box. However what do any of you do with the inserts? Keeping all the POP boxes up right and intact would be great but the problem is we have so many it's taking up multiple moving boxes, and we are somewhat short on space. We are looking for an easier way to keep the original POP boxes w/ inserts without having to have 20 large boxes holding all of them.