my friend told me that you have to drop it really fast before you go in or drop it while your porting because it give u a few seconds of gap time while you port to linked to open your inventory but you have to do it fast and drop it on ground too and yes someone can pick it up.
the item you drop on ground if the original one and the one in your inventory is the duped one.
but every time i try i /fail because i do it to slow Dx
but a couple of people know about it to maybe one of your friend might know about it

my friend that knows about it doesn't get on much anymore so i cant ask him for full instructions T.T