I like Midnight

Sellers: - https://snag.gy/j8BJTt.jpg

http://backpack.tf/item/4641336222 - 19 Days @ 30 Keys

Sale 1)

https://marketplace.tf/items/1108;5;u3008 - Sold here for $40 - Keys Are $2.10 - https://snag.gy/B1Zvi4.jpg = (19)

Sale 2)

http://backpack.tf/profiles/76561198014564575#!/compare/1492992000/1493078400 - Quicksold (Took 4 Days) for (21) Keys (Higher than sale 1 so can be counted)

Sale 3)

http://backpack.tf/profiles/76561198086480198#!/compare/1494374400/1494460800 + http://bazaar.tf/trade/1540984 - Sold for (20) Keys Pure

Note: http://backpack.tf/item/4983450283 - Sale did happen, seller likely Broke Keys for Ref

Sale 4)

http://backpack.tf/profiles/76561198136774106#!/compare/1494633600/1494720000 - Sold for a Mega Strike Taunt: Party Trick (35)

Sale 5)

http://backpack.tf/profiles/76561198251850048#!/compare/1487894400/1488153600 - SCM

Sales we have are:

19, 20, 21 and 35

35 Is an Obvious Outlier.

Thanks =)