Oh boi

-Sold for 18 pure: http://backpack.tf/profiles/76561198066065032#!/compare/1486857600/1487030400

-Quicksold for 14 pure: http://backpack.tf/profiles/76561198032582886#!/compare/1487808000/1487894400

-Quicksold for 14 pure: http://backpack.tf/profiles/76561198253977142#!/compare/1487894400/1487980800 http://backpack.tf/item/2698242475

-Sold for a bubbling skid lid (17 keys) + 2 pure (19 keys total): http://backpack.tf/profiles/76561198079397616#!/compare/1487376000/1487980800 http://backpack.tf/item/2698242475

-1:1'd for an aussie knife (18 keys at the time): http://backpack.tf/profiles/76561198002186909#!/compare/1486684800/1486771200

-Quicksold for 14 pure: http://backpack.tf/profiles/76561198191234989#!/compare/1487894400/1487980800 http://backpack.tf/item/2698242475

-Sold for 25 pure, outlier: http://backpack.tf/profiles/76561198090956917#!/compare/1486252800/1486339200

-Quicksold for 13 pure: http://backpack.tf/profiles/76561198146652987#!/compare/1486598400/1487116800 http://backpack.tf/profiles/76561198148562373#!/compare/1487030400/1487116800

-1:1'd for a collector's spec ks loose cannon(~15 keys): http://backpack.tf/profiles/76561198337858743#!/compare/1487116800/1487203200

-1:1'd for an insomnia cranial(14 keys): http://backpack.tf/profiles/76561198161516217#!/compare/1482969600/1483056000

-Sold for 15 pure: http://backpack.tf/profiles/76561198047365720#!/compare/1487894400/1487980800

-Sold for an aussie proks FaN(~12 keys) + ~4 keys in sweets (16 keys total): http://backpack.tf/profiles/76561198047365720#!/compare/1488067200/1488153600

-1:1'd for a dbd respectless glove(20 keys): http://backpack.tf/profiles/76561198283042853#!/compare/1487203200/1487289600

Taking 16-20 thanks to the sales above, buyers counter 15 and below.

ALL credit goes to Mindacos.