Aye! It's festive season!

Usable Sales

-Sold for 20 keys pure: http://backpack.tf/profiles/76561198044934255#!/compare/1480464000/1480550400

-Sold for a blizz samur(19 keys) + buds(1.8 keys, rounding to 2) + a genuine nostromo(~.5 keys, rounding to 1) (22 keys total): http://backpack.tf/profiles/76561198006544512#!/compare/1475539200/1475625600

-1:1'd for a bubbling human cannonball(16.5 keys, rounding to 17): http://backpack.tf/profiles/76561198142871805#!/compare/1475625600/1475712000

-Sold for a blizz trilby(21 keys) + 3 keys in sweets (24 keys total): http://backpack.tf/profiles/76561198019556015#!/compare/1475884800/1475971200

-1:1'd for an OF sarge's drill hat(16 keys): http://backpack.tf/profiles/76561198255263038#!/compare/1476748800/1479081600

Unusable Sales

-Bulk: http://backpack.tf/profiles/76561198088331543#!/compare/1478390400/1478476800

-Bulk, involves the duped frostbite front runner and the blizz bonk boy: http://backpack.tf/profiles/76561198149688091#!/compare/1478476800/1478563200

-???, key IDs don't match: http://backpack.tf/profiles/76561198218393641#!/compare/1478563200/1478649600

-???, history: http://backpack.tf/item/5090857263 says the sale occurred at this time: http://backpack.tf/profiles/76561198070593964#!/compare/1479772800/1479945600

-???, didn't involve the C9 slope: http://backpack.tf/profiles/76561198067598194#!/compare/1477180800/1477267200

-Sold for 14 pure + sweeties, quicksell outlier: http://backpack.tf/profiles/76561198257082566#!/compare/1481155200/1481241600 -credits to Foamy for this one

-1:1'd for a pro ks aussie frontier justice(13 keys, outlier): http://backpack.tf/profiles/76561198230050964#!/compare/1477094400/1477353600

Taking 16-24 thanks to the sales above. While yes, this range may be wide, Foamy noted that the is a pure sale in the middle and 2 sales to support either end.