Slight change.

Sale #1:

Sold with 2.5 keys for DBD Ye Oiled Baker Boy (18)

http://backpack.tf/profiles/76561198119936533#!/compare/1474070400/1474156800

http://backpack.tf/profiles/76561198196583593#!/compare/1474156800/1474243200

18 - 2.5 = ~16 keys (low outlier)

Sale #2:

Sold for Steaming Armoured (18.5) + ~2 keys in items

http://www.tf2outpost.com/trade/28484553

http://backpack.tf/profiles/76561198145580386#!/compare/1474070400/1474156800

18.5 + 2 = 20.5; rounds to 21 keys

Sale #3:

Sold for Planets Luckyshot (like rly overpriced someone pls update)

http://backpack.tf/profiles/76561198097135729#!/compare/1472169600/1472256000

Sale #4:

Sold for 19 keys + ~2 keys in items

http://www.tf2outpost.com/trade/28434053

http://backpack.tf/profiles/76561198098752224#!/compare/1471824000/1471910400

19 + 2 = 21 keys

Sale #5:

Sold for Dusk Pyro's Boron Beanie (mini at 24) + minor sweets

http://www.tf2outpost.com/trade/28441666

http://imgur.com/a/9ZKFF

Total is 24 keys, caps at B/O of 21 keys

Dusk Pyro's Boron Beanie:

http://i.imgur.com/zE2JIsl.png 24 keys

http://www.tf2outpost.com/trade/28459444

Classifieds:

http://i.imgur.com/339VRn9.png Sellers at 19, 19, 21, 21. Buyers at 15, 14, 14.

http://www.tf2outpost.com/trade/28464029 Has been selling at 19 keys for 2-3 weeks

Conclusion:

Sales at 16, 21, 21, and 21. Sellers at 19-21. Buyers at 15-14. Range should be 19-21 keys.