Sellers:

https://marketplace.tf/items/47;5;u14

https://backpack.tf/item/276856943

http://www.tf2outpost.com/trade/29213899

http://www.tf2outpost.com/trade/29213744 - b/o: $154.99 = 75 keys

http://www.tf2outpost.com/trade/29204184 - b/o: 77 keys (1 week)

Sold:

http://www.tf2outpost.com/trade/29178161

https://backpack.tf/profiles/76561198054155868#!/compare/1495756800/1496016000

https://backpack.tf/profiles/76561197993989727#!/compare/1495843200/1496016000 - sold with sweets (6) for Sunbeams Furious Fukaamigasa (70) = 64 keys

https://backpack.tf/profiles/76561198054155868#!/compare/1496188800/1496275200 - sold for Sunbeams Furious Fukaamigasa (70) + 3 keys + sweets (10) = 83 keys (outlier)

https://backpack.tf/profiles/76561198164651434#!/compare/1494547200/1494633600

https://backpack.tf/profiles/76561198054155868#!/compare/1494374400/1494633600 - sold for Miami Nights Company Man (35) + 16 keys + sweets (14) = 65 keys

http://www.tf2outpost.com/trade/28832484

https://backpack.tf/profiles/76561198039731024#!/compare/1490400000/1490486400 - sold for 50 keys (outlier)

https://backpack.tf/profiles/76561197961172123#!/compare/1490832000/1490918400 - bulk

http://www.tf2outpost.com/trade/28743474

https://backpack.tf/profiles/76561198039839322#!/compare/1490659200/1490918400 - bulk

https://backpack.tf/profiles/76561198095549699#!/compare/1494892800/1494979200 - sold for Time Warp Surgeon's Stahlhelm (59) = 59 keys

http://www.tf2outpost.com/trade/28894564

https://backpack.tf/profiles/76561198065132511#!/compare/1493424000/1493856000 - sold for 59 keys

http://www.tf2outpost.com/trade/29212679

https://backpack.tf/profiles/76561198080179568#!/compare/1496448000/1496534400 - sold for 59 keys

http://www.tf2outpost.com/trade/28903534

https://backpack.tf/profiles/76561198164036774#!/compare/1493769600/1493942400 - sold for Kill-a-Watt Hong Kong Cone (54) + 5 keys = 59 keys

https://backpack.tf/profiles/76561198112281935#!/compare/1491782400/1492041600 - sold for Circling Heart Frenchman's Beret + 3 keys = low

Mini's:

Sunbeams Furious Fukaamigasa:

https://backpack.tf/suggestion/593af701e338777548315c01 = 70 keys

Miami Nights Company Man:

https://backpack.tf/suggestion/593b01c50e2cad50af00b743 = 35 keys

Conclusion:

sales at 50, 59, 59, 59, 59, 64, 65, 83

taking 59-65 keys