https://steamcommunity.com/market/listings/440/Collector%27s%20Original

March 10 sold for $75.00 / 2.35 = 32 keys

https://marketplace.tf/items/513;14/

February 17, 2019 sold for $74.99 / 1.79 = 42 keys

https://marketplace.tf/items/513;14;kt-2/

January 18 sold for $40.00 / 1.75 = 23 keys

January 30 sold for $69.29 / 1.80 = 38 keys

https://marketplace.tf/items/513;14;kt-3/

January 13 sold for $60.00 / 1.76 = 34

January 20 sold for $75.00 / 1.75 = 43

February 4 sold for $55.00 / 1.81 = 30

February 27 two sold for $45.05 and $45.10 / 1.79 = 25 and 25

March 13 sold for $70.00 / 1.79 = 39

March 27 sold for $80.00 / 1.78 = 45

https://gyazo.com/8329bdb1b725b9a17a8953deeaace452

Quickbuyers over 23 keys

Sales:

23, 25, 25, 30, 32, 34, 38, 39, 42, 43, 45

Excluding 23-25 as low because buy orders.

Sellers:

https://gyazo.com/14a43b6ff255b12e567f19c1ad4c1dd8

https://backpack.tf/classifieds?item=Original&quality=14&tradable=1&craftable=1&australium=-1

https://marketplace.tf/items/513;14;kt-3/

40 and 50 keys