Sale 1:

Sold for Duped Burning Gatsby

http://www.tf2outpost.com/trade/27857659 - B/O of 60

Seller: http://backpack.tf/profiles/76561198074789287/#!/compare/1455609600/1455696000

Buyer: http://backpack.tf/profiles/76561198061874792/#!/compare/1455609600/1455696000

X = 59

Sale 2:

Seems to have sold for Haunted Ghosts Connoisseur Cap and a key

http://www.tf2outpost.com/trade/27861401 - B/O of 58

Seller: http://backpack.tf/profiles/76561198061874792/#!/compare/1455955200/1456041600

Buyer: http://backpack.tf/profiles/76561198061874792/#!/compare/1455955200/1456041600

X = 53 + 1

X = 54

Sellers:

60 keys:

http://puu.sh/ojkzI/095a75a425.png - 3 months

http://www.tf2outpost.com/trade/27927860 - 1 month

Gatsby mini:

Sale 1:

Sold for Pro. KS Australium Grenade Launcher + Galactic Codex Head Full of Hot Air + 3 keys in metal and items

http://www.tf2outpost.com/trade/27851869 - B/O of 65

Seller: http://backpack.tf/profiles/76561198242501446/#!/compare/1455609600/1455696000

Buyer: http://backpack.tf/profiles/76561198061874792/#!/compare/1455609600/1455696000

X = 30 + 23 + 3

X = 56

Sale 2:

Sold for Peace Sign Beak + 6 keys in items

Cannot find outpost link

Seller: http://backpack.tf/profiles/76561198074789287/#!/compare/1455868800/1455955200

Buyer: http://backpack.tf/profiles/76561198079474904/#!/compare/1455868800/1455955200

X = 55 + 6

X = 61

Sale 3:

Sold for Searing Gatsby + 24 keys?

http://www.tf2outpost.com/trade/27946168 - Offers, declined a scorching geisha

Seller: http://backpack.tf/profiles/76561198079474904/#!/compare/1458111600/1458630000

Buyer: http://backpack.tf/profiles/76561198121944933/#!/compare/1458457200/1458543600

X = 17 + 24

X = 41

41 is an outlier

Going with 56-61 (58.5) for the Gatsby