Request by K1ng.

Resuggestion, thanks to TUM for the info!

Sale 1

Sold for 16 keys pure

https://backpack.tf/profiles/76561198021055079#!/compare/1533859200/1533945600

https://backpack.tf/profiles/76561198067243236#!/compare/1533859200/1533945600

Sale 2

Sold for 14 keys pure

https://backpack.tf/profiles/76561198018528305#!/compare/1531699200/1531785600

https://backpack.tf/profiles/76561198341411993#!/compare/1531699200/1531785600

Keys from the Black Box and painted Stash were used for the Jeepcap so not tracked on buyer's side.

Sale 3

Bulk for Blizzy Hong Kong Cone (used there)

https://backpack.tf/profiles/76561198341411993#!/compare/1534204800/1534377600

https://backpack.tf/profiles/76561198160856661#!/compare/1534291200/1534377600

Sale 4

Untraceable

https://backpack.tf/profiles/76561198327078449#!/compare/1530576000/1531008000

https://backpack.tf/profiles/76561198073205925#!/compare/1530748800/1531008000

Sale 5

Untrace

https://backpack.tf/profiles/76561198073205925#!/compare/1531440000/1531526400

https://backpack.tf/profiles/76561198394877897#!/compare/1531353600/1531440000

Sale 6

Sold for 14.5 keys = 15 keys

https://backpack.tf/profiles/76561198394877897#!/compare/1532044800/1532131200

https://backpack.tf/profiles/76561198316655937#!/compare/1532131200/1532217600

Keys from the Vivid Plasma Gonzilla were used here so buyers side didn't track the keys.

Sale 7

Quicksold to buy order

https://backpack.tf/profiles/76561198316655937#!/compare/1532217600/1532822400

https://backpack.tf/profiles/76561198448505909#!/compare/1532217600/1532304000

Sale 8

Supposedly only sold for 11 keys? I counted 13 keys on buyers side (histories matched) so going with that.

https://backpack.tf/profiles/76561198448505909#!/compare/1532304000/1532476800

https://backpack.tf/profiles/76561198204433501#!/compare/1532217600/1532995200

Sale 9

Sold for a Smoking Jeepcap (11.5 keys, 3 days ago) and 4 keys = 15.5 keys = 16 keys

https://backpack.tf/profiles/76561198002757046#!/compare/1530057600/1530144000

https://backpack.tf/profiles/76561198124543178#!/compare/1530144000/1530230400

Sale 10:

https://backpack.tf/profiles/76561198160856661#!/compare/1537574400/1537660800

https://backpack.tf/profiles/76561198136290825#!/compare/1537401600/1537660800

Bulk.

Sale 11:

https://backpack.tf/profiles/76561198080179568#!/compare/1537228800/1537315200

https://backpack.tf/profiles/76561198173891483#!/compare/1537315200/1537401600

Sold for 15 keys

K1ng's Part:

There are two unconfirmed sales at 13 here (plus a bunch at ~13.5):

https://bot.tf/stats/item?def=417&q=5&ef=Blizzardy+Storm&craft=1&aus=0&ks=0

I would go with 13-16 here.

Taking 13 - 16 keys