More sales:

Sold for a Duped Purple Energy Cosa Nostra Cap

http://backpack.tf/profiles/76561198115823551#!/compare/1471996800/1472083200

http://www.tf2outpost.com/trade/28427278 B/O was 70

^Should be used for the Cosa, however this supports 70.

Sold for 72 Keys

http://backpack.tf/profiles/76561198053008424#!/compare/1472169600/1473033600

DUPED SALE

Sold for a Vivid Plasma Detective Noir(28 Keys), an Australium Pro KS Ambassador(~19 Keys) and ~41 Keys in Sweets(88 Keys total, Outlier)

http://backpack.tf/profiles/76561198090956917#!/compare/1469059200/1469145600

Vivid Plasma Detective Noir quick mini(probably has alot more sales)

Sold for a Blizzardy Storm Company Man(27 Keys) and ~1 Key in Sweets(28 Keys total)

http://backpack.tf/profiles/76561198053252981#!/compare/1470528000/1470614400

Using 28.

So we have a supportive sale at ~70(B/O), a pure sale at 72, a sale at 82 and a duped sale at 88. I think it's fair to call the 88 sale an outlier though. This should be fine