Do rep watches also have rep serial numbers? I ask because after a big party, friends of mine found a Rolex left at their house. They contacted everyone - but no one claimed it which seemed crazy to me. Could it be because it's a rep I theorized - but they took the bracelet off and it does have a serial number. Is it still possible it's a rep? (Looked up the number online - it does come back to an older DJ model.)