Sale 1:

Sold for Australium Medi Gun + Strange Killstreak Original + Strange Pro. KS Ambassador + 28 keys

http://www.tf2outpost.com/trade/27767831 - No B/O

Seller: http://backpack.tf/profiles/76561198028850197/#!/compare/1455264000/1456646400

Buyer: http://backpack.tf/profiles/76561198135388233/#!/compare/1456560000/1456646400

X = 31 + 28 + 8 + 7

X = 73

Sale 2:

Sold for Burning Furious Fukaamigasa

http://www.tf2outpost.com/trade/27939070 - B/O of 65

Seller: http://backpack.tf/profiles/76561198125791160/#!/compare/1458543600/1458630000

Buyer: http://backpack.tf/profiles/76561198127895021/#!/compare/1458543600/1459728000

X = 65 (Capped by B/O)

Sale 3:

Sold for Death at Dusk Panama + 2 keys + 24 keys in items

http://www.tf2outpost.com/trade/27811648 - B/O of 75

Seller: http://backpack.tf/profiles/76561198068909571/#!/compare/1456128000/1456732800

Buyer: http://backpack.tf/profiles/76561198081450612/#!/compare/1456128000/1456473600

X = 45.5 + 24 + 2

X = 62

Sale 4:

Bulk for Cloudy Moon Softcap

Seller: http://backpack.tf/profiles/76561198127895021/#!/compare/1459728000/1460073600

Buyer: http://backpack.tf/profiles/76561198059674109/#!/compare/1459209600/1459728000

Sale 5:

Sold with Power Surge Soldered Sensei for Green Energy Trophy Belt

Seller: http://backpack.tf/profiles/76561198081450612/#!/compare/1457164800/1457251200

Buyer: http://backpack.tf/profiles/76561198125791160/#!/compare/1457164800/1457251200

Should be used to update the trophy belt

Sellers:

60 keys:

http://puu.sh/okgvx/5c00afa209.png - 3 days, unbumped, excluding from range

70 keys:

http://www.tf2outpost.com/trade/28041590 - 1 week

Sales at:

62

65

73

Sale at 73 was a mix of pure/aussie/items (mostly pure and aussie), therefore, not excluding.

Going with 62-73