I hear what you’re saying George. In a perfect world .....
I suppose if one says “mint in box” then the model should be as it was the very day that it was packed up at the factory ready to be sold to its first owner. I think when people sell models and advertise them as you stated that ASIDE from mentioned issue or missing part the model is otherwise in “mint” condition. Say for example I were to sell my DM 1:12 Cadillac. ALL THE lights and features work, the paints flawless, no rash etc. I have it in it’s original boxes. Say I lost the hood ornament ( it came as a removeable piece). Could I rightfully say “The model is In mint condition in its original boxes, however it’s missing the Goddess hood ornament “. I have no issue with this description as long as I get a mint, perfect model that’s just missing the ornament. It’s sort of like when people sell real cars. They say body and interior are in like new condition, however there is a 3” scratch on the left door from a bicycle I got to close to in the garage. Just my two cents/thoughts. I do see though how this might bother you or other collectors. For me I’m ok with it!