Stupid-ass dumb-ass range.

Using last month.

Sale 1:

Sold for Stormy Storm Trucker’s Topper (Suggestion at 17)

No outpost

Seller: https://backpack.tf/profiles/76561198024867201#!/compare/1525910400/1525996800

Buyer: https://backpack.tf/profiles/76561198175643622#!/compare/1525910400/1525996800

X = 17

Sale 2:

Sold for ’72 Pool Party (Suggestion at 11.5) + ~5.5 keys in items

No outpost

Seller: https://backpack.tf/profiles/76561198063640894#!/compare/1526256000/1526342400

Buyer: https://backpack.tf/profiles/76561198394089731#!/compare/1526256000/1526342400

X = 17

Sale 3:

Sold for 11 keys

Seller: https://backpack.tf/profiles/76561198305676157#!/compare/1525132800/1525219200

https://backpack.tf/item/6774264770 - Buyer can’t be identified.

Bot.tf confirms: https://i.imgur.com/QDjlikQ.png

X = 11

Sale 4:

Quicksold for 9 keys

Seller: https://backpack.tf/profiles/76561198305676157#!/compare/1525564800/1525651200

https://backpack.tf/item/6715430555 - Buyer can’t be identified again.

Bot.tf confirms: https://i.imgur.com/QDjlikQ.png (sold in 4 hours)

X = 9

https://backpack.tf/u/76561198152299329 - This user is most likely the buyer of both sales above, as their name appeared on both histories, though looking at their backpack compare links doesn’t appear to help.

Sale 5:

Bulk for Cool Flamethrower

Seller: https://backpack.tf/profiles/76561198152299329#!/compare/1525996800/1526083200

Buyer: https://backpack.tf/profiles/76561198063640894#!/compare/1525996800/1526083200

Sale 6:

Sold with 3 keys for Grail Dueling Banjos

Seller: https://backpack.tf/profiles/76561198175643622#!/compare/1526083200/1526169600

Buyer: https://backpack.tf/profiles/76561198162282453#!/compare/1526083200/1526169600

Can be used on the Banjo.

'72 Pool Party:

https://backpack.tf/suggestion/5b0300fd44325a4ff94b0517

Stormy Trucker's:

https://backpack.tf/suggestion/5b02faefcf6c7562ed08d712

Sellers:

24 keys:

https://i.imgur.com/p2Pz121.png

https://backpack.tf/item/6774264770

https://backpack.tf/item/6715430555

26 keys:

https://i.imgur.com/KdlLswn.png

https://backpack.tf/item/6819622449

Sales at:

9

11

17 (2x)

11 shouldn’t be excluded, it took quite a bit to sell. Excluding 9 as it quicksold though.

Going with 11-17.