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Cardboard Box

The cardboard box from Metal Gear Solid!

Press primary fire to make an alert noise!
Press secondary to toggle between having the box be visible or invisible if you are ducking and staying still.
Duck to equip the cardboard box!

The cbox_stealth cvar controls the stealth modes of the box. Set this to 0 to disable stealth, 1 to allow stealth to be toggled by the player and 2 to force stealth.

No, this does not work on NPCs. It is purely cosemetic, so it will only work on players.
Want to use this against NPCs? The Improved Stealth Mod by Max Shadow supports this SWEP! http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=608796788

The box model itself was borrowed from GMod Tower. If there's some sort of legal problem then I'll be glad to change the model.