They show you a plethora of loot crates you can possibly get from the vault, but it's likely (like me) to get multiple duplicates. I ordered multiple in the hopes i'd receive something sweet that i didn't already have. They shipped me 4 of the exact same crate. After talking to a service rep, they took back 3 of them and promised that none of them would be the same.
Much better than what I thought would happen.