Went off and checked the insides of the pair I just bought. Stitching is fine.
I mentioned that I received a mismatched pair a week ago. One boot size 8.5 and the other 10.
The mismatched pair were also covered with that light colored fuzzy dusty stuff you can kind of see in @Fenderplyr's pic.
The pair I kept were in nicer condition. No fuzzy stuff.