Biggest issue is that the GE Russian sale doesn't match. Russian was sold for pure, some of which can be seen in the compare before the Salty, and which matches by item histories.

http://backpack.tf/profiles/76561198048008254#!/compare/1496102400/1496188800 - Nothing on the seller's side matches either

But it sold in a day regardless, so whatever it sold for maybe that isn't the best sale to use anyway.

Sale #2 wasn't SCM, it was sold to Roque's buy order for 14 pure. Not valid.

https://marketplace.tf/items/611;5;u107 - ~45 keys via Marketplace, nearly 3 months old but it's the only sale that can be tracked here

Could either try 45 or just wait for some newer usable sales, but this isn't supported as it stands.