I try to keep samples of packaging styles rather than collecting every box. Because individual box art aside, they're pretty much the same. Keeping card/box art was more essential when I was collecting G1 because the internet didn't exist, but now it does and you can always look up clear scans of packaging artwork online.

So for example, I've kept my Legacy Cosmos' box as an example of a Legacy Deluxe Class box, but chucked out the rest etc.