Sale 1:

Sold for 10 keys + Tour of Duty Ticket (<0.5)

No outpost

Seller: http://backpack.tf/profiles/76561198090956917#!/compare/1484006400/1484092800

Buyer: http://backpack.tf/profiles/76561198249521624#!/compare/1483228800/1485475200

X = 10

Sale 2:

Sold for Collector’s Pro. KS Your Eternal Reward (Mini at 10+ below) + Strange Spy-Cicle (~0.5)

http://www.tf2outpost.com/trade/28730025 - B/O of 10.5

Seller: http://backpack.tf/profiles/76561198182213262#!/compare/1484784000/1484870400

Buyer: http://backpack.tf/profiles/76561198321230119#!/compare/1484784000/1484870400

X = 10 (Capped by B/O, rounded down)

Sale 3:

Quicksold-ish for 9 keys

http://www.tf2outpost.com/trade/28742586 - Deleted B/O

Seller: http://backpack.tf/profiles/76561198046208108#!/compare/1485388800/1485475200

Buyer: http://backpack.tf/profiles/76561198142671399#!/compare/1484611200/1485475200

X = 9

Sale 4:

Quicksold for 9 keys

http://www.tf2outpost.com/trade/28675127 - No/deleted B/O

Seller: http://backpack.tf/profiles/76561198036254026#!/compare/1482364800/1482451200

Buyer: http://backpack.tf/profiles/76561198119428262#!/compare/1482364800/1482451200

X = 9

Sale 5:

Sold with ~8 keys in items for Spec. KS Aussie Ambassador (15)

Seller: http://backpack.tf/profiles/76561198321230119#!/compare/1484870400/1484956800

Buyer: http://backpack.tf/profiles/76561197998934095#!/compare/1484784000/1484870400

X = 7

Sale 6:

Sold for Nuts n Bolts Copper’s Hard Topper + cheap cosmetic?

No outpost

Seller: http://backpack.tf/profiles/76561197998934095#!/compare/1484870400/1484956800

Buyer: http://backpack.tf/profiles/76561198131089513#!/compare/1481241600/1484956800

Don’t know if anything else was included in the sale. If not, this’ll be low.

Your Eternal Reward Mini:

http://steamcommunity.com/market/listings/440/Collector%27s%20Professional%20Killstreak%20Your%20Eternal%20Reward

Recent sale at $29.99

Seller received $26.09

This’ll be more than 10 keys

Sales at:

7

9

10

9 quicksold twice. Excluding 9 and lower.

Going with 10 flat.