Duping is probably possible in the game and people are likely abusing it with Merchant's Guild to generate Gold.

We’re not aware of an active dupe exploit as all the ones we’ve reproduced at this point are a client/server mismatch and visual only which resolves on the players end as having no duped item as soon as the leave a zone or other.

If you think you know an active dupe that is not a client/server mismatch where you keep the item please message me with details and we’ll make it our highest priority to hotfix. We did have an actual dupe that we fixed the same day we were made aware of it.

It’s a good thought, but it would nearly double our item data which has performance and cost concerns. Then to ensure it’s actually unique across all those records would probably entail the identifiers being prepended by the actual character ID to ensure we don’t have to do a comparison check across all records(that would be a crazy operation to perform each time an item is generated)… making it ~triple the data. Our engineering team may have a more optimal way than that, but either way it would greatly expand data storage, and keeping individual item data as condensed as possible is very important.

To be clear, there could be a dupe but if there is our team is not currently aware of it. When there was a real one previously we received a lot of messages and videos on how to reproduce it and we were able to fix it very quickly. Since we’re not getting those I assume this is either a remnant of the one we fixed from before or a new method exists but is not widespread.