Sellers:

http://www.tf2outpost.com/trade/29181378 - b/o: 20 keys (2 weeks)

http://www.tf2outpost.com/trade/29196201 - b/o: 23 keys (1 week)

Sold:

http://backpack.tf/profiles/76561198081422715#!/compare/1495324800/1495411200 - sold for Silver Cyclone Taunt: Buy A Life (27) = 27 keys (outlier)

http://backpack.tf/profiles/76561198081422715#!/compare/1495238400/1495324800 - sold for Flaming Lantern German Gonzila (22) = 22 keys

http://backpack.tf/profiles/76561198119428262#!/compare/1495152000/1495238400 - bulk

http://backpack.tf/profiles/76561198048889059#!/compare/1493337600/1493942400

http://backpack.tf/profiles/76561198119428262#!/compare/1494460800/1495065600 - ?

http://www.tf2outpost.com/trade/28904247

http://backpack.tf/profiles/76561198104618116#!/compare/1494547200/1494633600

http://backpack.tf/profiles/76561198107520045#!/compare/1494547200/1494633600 - sold with 9 keys + sweets (9) for Haunted Ghosts Thirst Blood (40) = 22 keys

http://backpack.tf/profiles/76561198106233311#!/compare/1493769600/1493856000

http://backpack.tf/profiles/76561198104618116#!/compare/1493856000/1494028800 - ?

http://www.tf2outpost.com/trade/29181378

http://backpack.tf/profiles/76561198107520045#!/compare/1495497600/1495584000 - sold for 20 keys

Credits to K1ng

Mini’s:

Silver Cyclone Taunt: Buy A Life:

http://backpack.tf/suggestion/593007c1e3387718eb355bdf = 27 keys

Flaming Lantern German Gonzila:

http://backpack.tf/suggestion/593009370e2cad67fe57c44d = 22 keys

Conclusion:

sales at 20, 22, 22, 27

sellers at 20, 23

taking 20-22 keys