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Items do have a bit of information called a "fingerprint".
It is really a little remnant from the item generation process. A kind of "seed", but since it is usually unique for each item it is probably the best way to discern a dupe.
I guess the dupe detector works by finding items with identical fingerprints and then deleting them.
Too bad they don't show up in the item tally, they could have been really useful for a trader who does not want to be scammed (having a reference sheet of known duped fingerprints handy).
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