Sale 1:

Sold for Pro. KS Aussie Grenade Launcher (20) + Wrench skin (~5)

No outpost

Seller: https://backpack.tf/profiles/76561198380759257#!/compare/1495756800/1495843200

Buyer: https://backpack.tf/profiles/76561198142320206#!/compare/1495756800/1495843200

X = 25

Sale 2:

Sold for Overclocked Big Chief (20.5) + <2 keys in items

No outpost

Seller: https://backpack.tf/profiles/76561198018719204#!/compare/1491177600/1491264000

Buyer: https://backpack.tf/profiles/76561198314349856#!/compare/1491177600/1491350400

X = 22

Sale 3:

Sold with a couple keys for Strange Massed Flies Patriot Peak

Seller: https://backpack.tf/profiles/76561198314349856#!/compare/1491609600/1491696000

Buyer: https://backpack.tf/profiles/76561198059439540#!/compare/1491609600/1491696000

Should be used on the Peak

Sale 4:

Bulk for Cloudy Moon Tossle

Seller: https://backpack.tf/profiles/76561198059439540#!/compare/1491868800/1491955200

Buyer: https://backpack.tf/profiles/76561198153402711#!/compare/1491868800/1491955200

Sale 5:

Bulk for FoD Second Rate Sorcery

Seller: https://backpack.tf/profiles/76561198142320206#!/compare/1497139200/1497312000

Buyer: https://backpack.tf/profiles/76561198101300189#!/compare/1497225600/1497312000

Sellers:

21 keys:

http://www.tf2outpost.com/trade/28890589 - 1+ month, currently listed on the SCM for around $62 USD

http://webcache.googleusercontent.com/search?q=cache:YcBhgEJj2bkJ:www.tf2outpost.com/trade/28890589+&cd=1&hl=en&ct=clnk&gl=au – price has been fairly consistent.

https://backpack.tf/u/76561198044861050

25 keys:

http://i.imgur.com/toyFbBl.png - 7 months

https://backpack.tf/u/76561198086948995

30 keys:

http://www.tf2outpost.com/trade/29226911 - 1 week

https://backpack.tf/u/76561198132627303

[u]Sales at:[/b]

22

25

Seller at 21 for over a month. Including that in the range.

7 month old seller at 25 shows that it cannot sell for 25, and therefore should be excluded.

Going with 21-22.