Sale 1:

https://marketplace.tf/items/981;5;u36

1 Sold on the 31st of October for 39.99 dollars

key price on the 31st of October = 1.79 dollars

39.99/1.79 ~ 22 keys

=============================================================================================================================

Sale 2:

https://backpack.tf/profiles/76561198239268670#!/compare/1543449600/1543536000

https://backpack.tf/profiles/76561198252999692#!/compare/1543363200/1543449600

Sold for a Blizzardy Storm Lucky shot ( 16 keys ) + 5ish keys in items = 21 keys

=============================================================================================================================

21-22 keys