Players are able to make multiple copies of Bags containing items by using the market stalls.
First a player buys the post box and puts their bag in it. They leave just far enough for the items to despawn and they head back to the box. The player then repeatedly takes out the bag on the top while grabbing the other “projected” one in the back. They do this very quickly to make multiple copies.
(I still need to personally test it, However one of my players told me this is how it works and that they’ve successfully done it. We’ve been having issues with duplicates on my server)
Please attach your game log files as a zip to this post.