Sellers:

http://www.tf2outpost.com/trade/29195295 - b/o: 27 keys (2 weeks)

Sold:

https://imgur.com/gallery/7ymDq

http://www.tf2outpost.com/trade/28886386

http://backpack.tf/profiles/76561198232041512#!/compare/1493942400/1494028800 - sold for Kill-a-Watt Noble Amassment of Hats (23) + sweets (9) = 26 keys b/o

http://backpack.tf/profiles/76561198213935600#!/compare/1494288000/1494374400 - sold with sweets (3) for Blizzardy Storm Modest Metal Pile of Scrap (22) = 19 keys (outlier)

http://backpack.tf/profiles/76561198118254940#!/compare/1494201600/1494288000

http://backpack.tf/profiles/76561198213935600#!/compare/1494201600/1494288000 - sold for Kill-a-Watt Company Man (25) = 25 keys

http://backpack.tf/profiles/76561198118254940#!/compare/1494115200/1494201600

http://backpack.tf/profiles/76561198197624871#!/compare/1494115200/1494201600 - sold for Strange Specialized Killstreak Australium Stickybomb Launcher (13) + Strange Specialized Killstreak Australium Grenade Launcher (14) = 27 keys

http://backpack.tf/profiles/76561198271935163#!/compare/1492646400/1492732800 - bulk

http://backpack.tf/profiles/76561198271935163#!/compare/1491523200/1491955200 - scm

http://backpack.tf/profiles/76561198034095893#!/compare/1491264000/1491436800

http://backpack.tf/profiles/76561198219278357#!/compare/1491004800/1491782400 - scm

Conclusion:

sales at 19, 25, 26, 27

taking 25-27 keys

Previous Suggestion: http://backpack.tf/suggestion/5926bebe0e2cad3b93603d44