On the SMP Server you can choose ONE item from the Gold Crate per Key
/warp crates

x1 Pig Spawner
x1 Cow Spawner
x1 Spider Spawner
x1 Zombie Spawner
x1 Zombie Pigman Spawner
x1 Skeleton Spawner
x1 Blaze Spawner
x1 Creeper Spawner
x1 Iron Golem Spawner

"NOT AN OFFICIAL MINECRAFT PRODUCT. NOT APPROVED BY OR ASSOCIATED WITH MOJANG OR MICROSOFT"