year old price.

1 sale:

https://backpack.tf/profiles/76561198132226518#!/compare/1514764800/1514851200 Seller

https://backpack.tf/profiles/76561198167456698#!/compare/1514592000/1514851200 Buyer

Sold for Burning HoC,(180) + Misty Gonzila + Collector's Bootlegger(11) + Strange Pro KS C.A.P.P.E.R.(14.36) + FT Hot Pro KS Blitzkrieg Knife + WW Orb Pro KS Reckoner Revolver(23.5) + Pro KS Batsaber(10.88)

Gonzila Mini:

https://marketplace.tf/items/323;5;u44

Only sale is marketplace sale

Sold for 119.99.

Keys @ 1.99, meaning it sold for 60.3 keys

Listing at 65 keys.

Using 60 keys.

Knife Mini:

https://backpack.tf/profiles/76561198278719475#!/compare/1509667200/1519862400

http://steamcommunity.com/market/listings/440/Unusual%20Blitzkrieg%20Knife%20%28Field-Tested%29

https://backpack.tf/profiles/76561198119616750#!/compare/1513814400/1514246400

Presumably sold on SCM for 33.47 keys

https://backpack.tf/profiles/76561198232041512#!/compare/1510185600/1510272000

https://backpack.tf/profiles/76561198305021692#!/compare/1510272000/1510358400

Sold with a key for Ooze Hetman(35)

Total is 35 - 1 = 34 keys

https://backpack.tf/profiles/76561198156255538#!/compare/1517875200/1517961600

https://backpack.tf/profiles/76561198083415007#!/compare/1517875200/1517961600

Sold for 31 pure + Spec KS Knife(1.9)

Total is 32.9 keys

using 33 keys.

Total is 180 + 60 + 11 + 33 + 23.5 + 14.36 + 10.88 = 332.74 keys

Rounding to 330 keys.