Re-Sugg From Here

Marketplace.tf Sales:

https://marketplace.tf/items/tf2/30526;13;strange

$24.99/2.05=~12.1 Keys (Apr 28th)

Median Price of Keys at time of purchase was 2.05

SCM Sales:

https://steamcommunity.com/market/listings/440/Strange%20Haunted%20Arsonist%20Apparatus

https://steamcommunity.com/market/pricehistory/?appid=440&market_hash_name=Strange%20Haunted%20Arsonist%20Apparatus

$26.65/2.37=~11 Keys (Apr 27th)

$5.68/2.31=~2.3 Keys (May 5th)

$12.92/2.31=5.6 Keys (May 8th)

$22.19/2.34=~9.5 Keys (Jun 8th)

$21.84/2.33=~9.5 Keys (Jun 9th)

$24.75/2.18=~11 Keys (July 5th)

Total Sales:

2.3, 5.6, 9.5, 9.5, 11, 11, 12.1

Excluding Sales @2.3, 5.6 as obvious quicksells and dumps