I just received a few pairs of these dice. They are in perfect condition with matching numbers, sharp corners and no crystalizing noticed. Only one exception, they came in a plastic box that had foam inserts around the dice. The foam has deteriorated and left a residue wherever it was touching the dice. 2 questions, any suggestions on how to remove this foam residue? And anyone know the value of these dice? I found 1 website that had these dice listed as "scarce logo". I do have an extra pair, so if you need a pair make me an offer.