I agree, a missing piece isn't too bad as long as we know in advance. For mangled pieces, to me they are the same as missing. But if someone wanted to list NO MISSING they could still put a note on their puzzle that says that some are mangled. Again, so you know in advance what you are getting. To me, it isn't a huge deal if pieces have a FEW pieces with lifting edges and they are only lightly lifting. It is when they are really badly dinged that I want to know in advance. Aka: dog/cat ate it, etc.