This was brought up in one of the recent feedback meetings, but I thought I'd mention it here as well: currently, Thieves Troves give lots of treasure maps. This is awesome if you like hunting down treasures (as I do), but terrible in that the maps are "stolen": you cannot mail out duplicates to another account without going back and laundering them first.
This highlights how problematic treasure maps being "unique" is, that the ideal behaviour is to mail them to an alt account as soon as you get them. In addition, they cannot be stored in guild banks.
Experimenting with the latest PTS build and thieves troves resulted in the following issue:
Two identical treasure maps spawned in the same chest. I only have the following two options:
1. Destroy one of them so that the trove will respawn.
2. Leave the duplicate in the trove for someone else to find, which, in my opinion, is extremely rude to other plays who might be opening troves.
Two potential solutions:
1. Ensure that duplicates never drop in the same trove.
2. (Ideal solution) Remove the "unique" marker from treasure maps. I can't stress how much of a relief this would be, how much of a quality of life improvement it would be for banking and storage.