I bought a pair of glasses with the rubber listed as "like new." Somebody had clearly been gnawing on the ear stems like a rodent, lol. Those rubbers went into the trash immediately...you'll be surprised it's a fairly common bad habit out there in the public. I don't have anything against what people do with their toys, but that's revolting to send a sold item in a disgraced uncleaned manner to the new owner.
/rant