Hey, The postmaster is the overflow. It is meant to catch items that either did not fit in your inventory or that you missed while playing. It is not meant to be used as storage, as items can be lost from there. When turning in tokens in bulk, it's important to note that you will only get one "Postmaster Full" message per tower visit. Once you receive it, you need to either keep track of how many items are going to your postmaster, or you need to head to orbit and load again into the tower after emptying it, otherwise you could unintentionally push out items you intended to keep.