After so many years I can safely say that I have thrown out all but 4 of my built Zoids boxes. Including my HMM boxes.
Even in storage, the HMM boxes just weren't built to last. This summer Im working on my Psycho Geno Saurer and everytime I lift or close the top the edges basically collapse on themselves. The actual artwork creases really easily too.
I might pick this up and then feel a lot better about chucking that box. I hope the artbook includes a digital download, and maybe some prints or posters.