Sellers:

https://marketplace.tf/items/315;5;u30

https://backpack.tf/item/1568781828

http://www.tf2outpost.com/trade/29222865 - b/o: $100 = 48 keys

http://www.tf2outpost.com/trade/29206627 - b/o: 60 keys (1 month)

http://www.tf2outpost.com/trade/29219580 - b/o: 54 keys (3 days)

http://www.tf2outpost.com/trade/29227524 - b/o: 45 keys (14 hours)

http://www.tf2outpost.com/trade/29223943 - b/o: 50 keys (3 days)

Sold:

http://backpack.tf/profiles/76561198195731583#!/compare/1494806400/1494892800 - bulk

http://backpack.tf/profiles/76561198201646261#!/compare/1494374400/1494460800

http://backpack.tf/profiles/76561198195731583#!/compare/1494374400/1494460800 - ?

http://www.tf2outpost.com/trade/29069448

http://backpack.tf/profiles/76561198267189538#!/compare/1494288000/1494374400 - sold for Purple Energy Doctor's Sack (28) + Miami Nights Cold Killer (28) + 2 keys = 58 keys (outlier)

http://backpack.tf/profiles/76561198043687599#!/compare/1491955200/1492041600 - bulk

http://backpack.tf/profiles/76561198033378852#!/compare/1496534400/1496620800 - bulk

http://backpack.tf/profiles/76561198124615050#!/compare/1496275200/1496361600 - bulk

http://backpack.tf/profiles/76561198002757046#!/compare/1495756800/1495843200

http://backpack.tf/profiles/76561198124615050#!/compare/1495756800/1495843200 - sold with Roboactive Gentleman's Ushanka for 49 keys + Strange Professional Killstreak Australium Knife (24) + Strange Professional Killstreak Australium Tomislav (15) = bulk

http://backpack.tf/profiles/76561198068429580#!/compare/1495411200/1495756800 - sold for 44 keys (quicksold)

http://backpack.tf/profiles/76561198135388233#!/compare/1494806400/1494892800

http://backpack.tf/profiles/76561198068429580#!/compare/1494806400/1494892800 - sold for 47 keys

http://backpack.tf/profiles/76561198175249965#!/compare/1493769600/1493856000 - bulk

http://backpack.tf/profiles/76561198164959767#!/compare/1491696000/1492300800 - bulk

http://backpack.tf/profiles/76561198044125635#!/compare/1497139200/1497225600 - sold for Sunbeams Gentleman's Gatsby (53) = 53 keys

http://www.tf2outpost.com/trade/28889596

http://backpack.tf/profiles/76561198051186164#!/compare/1496275200/1496448000 - scm

http://backpack.tf/profiles/76561198012613726#!/compare/1491782400/1491868800 - sold for 52 keys

http://www.tf2outpost.com/trade/28867100

http://backpack.tf/profiles/76561198076370493#!/compare/1491609600/1491696000 - sold for 45 keys (quicksold)

http://backpack.tf/profiles/76561198011321852#!/compare/1491091200/1491177600 - bulk

Mini’s:

Sunbeams Gentleman's Gatsby:

http://backpack.tf/suggestion/5941ccd10e2cad183142daad = 53 keys

Conclusion:

sales at 44, 45, 47, 52, 53, 58

taking 47-53 keys