Sale #1

http://www.tf2outpost.com/trade/27473726 B/o 14 Keys

http://backpack.tf/profiles/76561197981484168?time=1448784000&compare=1448870400

Sold for a Strange Australium Scattergun, added 15 keys.

Strange Australium Scattergun = 35 Keys at the time of the sale

35 - 15 = 20 capped at 14

Sale #2

http://backpack.tf/profiles/76561198039312113?time=1448870400&compare=1449302400

http://backpack.tf/profiles/76561198134023679?time=1448870400&compare=1449216000

Collector's Professional Killstreak Gunslinger = 23 - 4 = 19 - 5 = 14

Strange Professional Killstreak Hitman's Heatmaker = 4 Keys

5 Keys

Mini: Collector's Professional Killstreak Gunslinger

https://steamcompanion.com/tf2/Collectors-Professional-Killstreak-Gunslinger/

$50.00 * 1.15 = $57.5 / 2.5 = 23 Keys

Sale #3

http://www.tf2outpost.com/trade/27374158 B/o 10 Keys

http://backpack.tf/profiles/76561198169508981?time=1446710400&compare=1446796800

Looks like it sold for 10 keys.

10 took less than a day, going 14 flat.

PRICE RANGE: 14 Keys