Sale 1:

Sold for 35 Keys Pure (34 Keys + 1 Key in refined)

http://imgur.com/a/fjbR2

Sale 2:

SCM Sale?

http://backpack.tf/profiles/76561198143488390#!/compare/1454659200/1456214400

Sale 3:

Sold for Vivid Rubber Glove + 1 Key + 8 Ref

http://backpack.tf/profiles/76561198246546920#!/compare/1463097600/1463184000

Mini on Glove

http://www.tf2outpost.com/trade/28124342 - B/O of 20 Keys for nearly 2 Weeks

Sold for 17 Keys?

http://backpack.tf/profiles/76561198044811790#!/compare/1461974400/1463184000

Regardless of whether the mini is accurate, it's probably safe to call this sale an outlier

Sale 4:

SCM Sale?

http://backpack.tf/profiles/76561198024777655#!/compare/1456128000/1456214400

Conclusion:

1 Valid sale at 35 Keys Pure, taking a flat range of 35 Keys