Ah, the wonders of 3D printing. Here are some real-life Mann Co. keys, printed by Reddit user ikonakona. You know, the things you need to open up those pesky crates in Team Fortress 2?

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Sure, you can't do anything with them, but still—neat thing to have on your keychain. See, for instance:

Though if you really wanted you could probably print the lock used in the game, put it around a crate, and stuff the crate with hats.

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Real life Mann Co. Keys - 3D printed [ikonakona]