This coupon can be found in the Overclock shop. It requires Overclock 1 or Overclock 0 with 300,000 Experience in order to be purchased. When toggled, your box pickups that are not rare will automatically sell to the shop. Toggle on/off with @toggle autosell in the lobby.
It will keep all +3 parts and rarer drops.

AutoSell BOT type: Any Item type: Coupon Req. Level: 0

Can be purchased for 400 Coins

Enables toggling automatically selling non-rare parts at the end of a game. [OC1]