Blizzard Q&A @ PlanetDiablo
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Category: News ArchiveHits: 950
Q: Why have some of my items of a certain type vanished?
A: Character files were scanned for duplicated items. All duplicate items but one were deleted.
Notes: Exactly how the scanning process works will probably never be officially revealed, since players have already proved to be very persistent in finding ways to dupe items. One fact we are aware of is that each item has an invisible, unique identifier assigned to it when the item generates in the game. This can be used to search for duplicates; if two items with the exact same identifier code are discovered, the system will remove them.