Sellers:

http://imgur.com/a/l6bqS

https://backpack.tf/item/1865582292 - b/o: 16 keys

Classifieds: https://backpack.tf/classifieds?item=Soldered%20Sensei&quality=5&tradable=1&craftable=1&australium=-1&particle=60

Screenshot(s) of Classifieds:

http://imgur.com/fvF75Gu

<Sellers>

16.23 keys | http://backpack.tf/item/2346777284 | http://backpack.tf/u/76561198344933095 | Listed a day ago [Bumped]

18 keys | http://backpack.tf/item/2261424185 | http://backpack.tf/u/76561198056793444 | http://www.tf2outpost.com/trade/28839388 | Listed 21 days ago [Bumped]

18 keys | http://backpack.tf/item/2640776979 | http://backpack.tf/u/76561198016070169 | Listed 10 days ago [Bumped]

19 keys | http://backpack.tf/item/2591923361 | http://backpack.tf/u/76561198023051867 | http://www.tf2outpost.com/trade/28854506 | Listed 1 week ago [Bumped]

http://www.tf2outpost.com/trade/28814327 - b/o: 19 keys (1 month)

Sold:

http://www.tf2outpost.com/trade/28850100

https://backpack.tf/profiles/76561198198306749#!/compare/1491091200/1491609600 - sold for 13 keys (quicksold)

http://www.tf2outpost.com/trade/28813264

https://backpack.tf/profiles/76561198198306749#!/compare/1487808000/1488758400 - sold for Circling Peace Sign Professional's Panama + Strange Festive Specialized Killstreak Balloonicorn Sniper Rifle (Field-Tested) = 19 keys b/o

https://backpack.tf/profiles/76561198197227615#!/compare/1488585600/1488672000 - sold for Blizzardy Storm Tartan Tyrolean = 20 keys (outlier)

Mini's:

Blizzardy Storm Tartan Tyrolean:

http://www.tf2outpost.com/trade/28805646

https://backpack.tf/profiles/76561198077251918#!/compare/1488153600/1488326400 - sold for 16 keys (quicksold)

http://www.tf2outpost.com/trade/28772289

https://backpack.tf/profiles/76561198079286878#!/compare/1486684800/1486771200 - sold with 1 key for Purple Confetti Sergeant's Drill Hat = 20 keys b/o