Adding my sale to the previous suggestion - http://backpack.tf/suggestion/586531c4c44045734e6840e9

Forgot to update my backpack before this suggestion, I don't actually own one anymore.

Sale 1:

Sold for 36 Keys Pure - http://imgur.com/a/QNikv

B/O of 36 Keys - Sold in 5 Days - http://www.tf2outpost.com/trade/28683638

Following sales are from previous suggestion, credits to ツ JoXu ツ

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Sale 2:

http://backpack.tf/profiles/76561198007953976#!/compare/1482192000/1482278400 seller

http://backpack.tf/profiles/76561198117597416#!/compare/1482192000/1482278400 buyer

Sold with a skin(~1) for an Overclocked Towering Pillar

Sale was used to price the Pillar ( http://backpack.tf/suggestion/5861df560e2cad6261629d06 ) so not valid here

Sale 3: (credits to Genzarata)

http://i.imgur.com/V2tvi3h.png

Buyer paid 66.85/1.96 = 34 keys

Seller received (66.85/1.15)/1.96 = 30 keys

Conclusion:

Valid sales at 30-34 Keys and 36 Keys. Taking the 29 Keys out of the range as it's actually invalid so pricing at a range of 30-36 Keys.