Wow my first suggestion!

Sale 1: Most Recent sale Bought this unusual for 76 keys pure

https://backpack.tf/profiles/76561198192602363#!/compare/1513641600/1513728000

Other perspective http://prntscr.com/hqalnn

Sellers on backpack for 76 and 85 keys pure both has been there for quite some time unsold

Marketplace seller is the same person with the 85 key seller on backpack so nothing there.

Im open to critism and or more proof of sales for this unusual but thanks for coming to check it out.