Only sale in the last 2 months from the previous suggestion was actually a sale of 2.3 pure at the time.

@op, looks like you paid 28 keys here - http://backpack.tf/profiles/76561198033396801?time=1422086400 ~2.2 pure at the time?

http://www.tf2outpost.com/trade/24431538 - 32 keys here ~2.3 pure

http://backpack.tf/profiles/76561198037694434?time=1420617600 - this one sold for 38 keys pure - 2.5 pure at the time

Wow. A lot of pure sales. And all in keys. I would give this a range of 2.3-3.3. Please close and resuggest. If I close it, you'll have -rep and you won't be able to resuggest.