Loot the World is an app that allows you to scan barcodes and QR codes to generate a random weapon drop, which you can then send to your in-game account through SHiFT. This page will have bar codes for items and stamps for the Loot the World mobile app. It was a good run for the app while it lasted. It would appear that any unused stamps or items in your inventory that were not already transferred to your character will be lost. I did not find anything listed on Gearbox's side but I did find a report on Game Informer. If you have the app installed on a phone and select the News option this message will be displayed. Please note that Loot The World has ended as of Oct 22, 2015.