Update: Credit to Wurth for the help.

Antifreeze Killer Exclusive with 200 keys for a duped Purple Energy Bonk Boy(Recently priced by me at 1020 keys). --- 820 keys

https://next.backpack.tf/suggestions/6328d9a5ac7ff67092047190 - Purple Energy Bonk Boy priced at 1020 keys.

https://next.backpack.tf/item/12227590967

Seller:

https://next.backpack.tf/profiles/76561198344363390/compare?from=1664668800&to=1664928000

Buyer:

https://next.backpack.tf/profiles/76561198351982960/compare?from=1663977600&to=1664496000

1020 - 200 = 820 keys

Going 820 keys flat

Afaik this is the only sale, and I'm open to constructive criticism in order to improve this price suggestion!

Thanks and have a great one! ^^