Sometimes a removable Liquidation sticker is applied
Sometimes the piece was supposed to include a bonus item, such as an extra pair of laces, and the extra laces are missing
Occasionally a piece has a stain which is usually dust / dirt from being tried on in the fitting room but on rare occasion the stain could be makeup or food. These stains are usually easily removable without the need for a washing machine.
Sometimes the piece looks worn or may actually be worn. We try to remove pieces with major signs of wear but it is not possible for us to catch 100%.
Sometimes a Costco Liquidation is actually a store return. The usual reason for return is "Didn't Fit". The reason for this is because Costco does not offer fitting rooms, so customers do not know it doesn't fit until they bring it home and try it on. Typically speaking, Costco Returns are brand new and in perfect condition however sometimes they may have some kind of imperfection, but usually the imperfection is super marginal.
It is not possible for us to catch every imperfection. We sort over 10,000 items a week so we do not have time to analyze each piece. You should expect there could be imperfections we did not see.