Sellers:

http://www.tf2outpost.com/trade/28683357 - b/o: 30 keys (4 months)

http://www.tf2outpost.com/trade/29172879 - b/o: 27 keys (3 days)

Sold:

https://marketplace.tf/items/96;5;u62 - sold for $50 = 23 keys (outlier)

http://www.tf2outpost.com/trade/28903133

http://backpack.tf/profiles/76561198067575136#!/compare/1493683200/1493769600 - sold for 26 keys

Credits to A Delicious Cashew

http://www.tf2outpost.com/trade/28897785

http://backpack.tf/profiles/76561198072702865#!/compare/1493337600/1493683200

http://backpack.tf/profiles/76561198067575136#!/compare/1493251200/1493337600 - sold with 8 keys for Scorching Flames Magnificent Mongolian = ?

http://backpack.tf/profiles/76561198054758757#!/compare/1494460800/1494547200 - ?

http://backpack.tf/profiles/76561198090956917#!/compare/1493683200/1493769600 - sold for 26 keys

http://backpack.tf/profiles/76561198036435156#!/compare/1491523200/1491955200 - bulk

http://backpack.tf/profiles/76561198063640894#!/compare/1491177600/1491350400 - sold for 21 keys + sweets = 26 keys

http://backpack.tf/profiles/76561198063640894#!/compare/1488240000/1488326400 - sold with 4 keys for Isotope Professional Killstreak Brick House Minigun (Well-Worn) = ?

http://backpack.tf/profiles/76561198073553007#!/compare/1491091200/1491177600 - sold for 26 keys

Mini's:

Scorching Flames Magnificent Mongolian:

no mini

Isotope Professional Killstreak Brick House Minigun (Well-Worn):

http://backpack.tf/profiles/76561198073472840#!/compare/1488931200/1489017600

http://backpack.tf/profiles/76561197994785911#!/compare/1488931200/1489017600 - sold for 13 keys + ?

no mini