all credits to marty, i didnt find this proof

Tesla Coil Pampered Pyro

https://backpack.tf/profiles/76561198048851745#!/compare/1498867200/1498953600

http://imgur.com/a/mgP7h

Sold for 16 keys pure

New sales:

https://marketplace.tf/items/30139;5;u108 - ~18 keys via MP

https://backpack.tf/profiles/76561198121040682#!/compare/1500163200/1501027200 - Quicksold to a 10 key buy order, invalid

https://imgur.com/a/3hbme - Buy order

http://www.tf2outpost.com/trade/29214814 - 13 key seller had listed at 24 for a week before abruptly taking less than half of that, also seems like a quicksell tbh

Sales at 13 (keys/quicksellish), 16 (keys), 18 (Cash), and 26 (taunt), with a mature but poorly bumped seller for 18.

I think 16-18 makes the most sense with what we have to work with.