I have a few, old AURORA and HAWK boxes from kits long built and discarded during moves but saved the boxes for reuse. I have also saved kit boxes from other manufacturers and am slowly trimming empty boxes for faming sometime in the future- provided I have wall space.
Unfortunately, assembled kits and my research library have eaten up a lot of space.
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Sure wish I had saved other model kit boxes but it appears Round2 Models is giving me a second chance by re-issuing kits from my " yoot " , as Cousin Vinny might say.