I think you should be able to buy items off of xur from the bungie app and transfer them to your mobile vault so if you can't make it home in time or on vacation you can still be able to get the loot that's just my opinion though
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Really, why the F would you want to get the disappointment of xurday while on vacation, he nvr sells anything good except heavy synth once in awhile, good luck gettin what you are looking for from that prick Rahool after you buy xurs engrams because we all know xur isn't random and just another way Bungie has to troll the players of destiny.