Sale 1:

Sold for 23 keys + ~1 key in ref

No outpost

Seller: https://backpack.tf/profiles/76561198195731583#!/compare/1503014400/1503100800

Buyer: https://backpack.tf/profiles/76561198080715589#!/compare/1501200000/1503100800

X = 24

Sale 2:

Sold for 21 keys

No outpost

Seller: https://backpack.tf/profiles/76561198313538268#!/compare/1502409600/1502496000

Buyer: https://backpack.tf/profiles/76561198170138453#!/compare/1502409600/1502496000

X = 21

Sale 3:

Quicksold for 18 keys

Seller: https://backpack.tf/profiles/76561198298210084#!/compare/1501286400/1501372800

Buyer: https://backpack.tf/profiles/76561198192531745#!/compare/1501286400/1501372800

X = 18

Sale 4:

Sold, most likely to a buy order, for 15 keys + <0.5 keys in ref

No outpost

Seller: https://backpack.tf/profiles/76561198296168912#!/compare/1501286400/1501372800

Buyer: https://backpack.tf/profiles/76561198298210084#!/compare/1501286400/1501372800

X = 15

Sale 5:

Sold with ~2 keys in pure/items for Tesla Coil Toadstool Topper

No outpost

Seller: https://backpack.tf/profiles/76561198192531745#!/compare/1501372800/1501545600

Buyer: https://backpack.tf/profiles/76561198379935841#!/compare/1501372800/1501545600

Will be a large outlier without a B/O cap, and too low to be used on the Toadstool. Excluding this sale.

Sale 6:

Sold with > 1.5 keys in metal/items for Cloud 9 Furious Fukaamigasa

Seller: https://backpack.tf/profiles/76561198379935841#!/compare/1501632000/1501718400

Buyer: https://backpack.tf/profiles/76561198371472421#!/compare/1501632000/1501718400

Can be used on the Fukaa.

Sale 7:

Bulk for Unusual nade launcher

Seller: https://backpack.tf/profiles/76561198205254623#!/compare/1497225600/1497744000

Buyer: https://backpack.tf/profiles/76561198071197720#!/compare/1497657600/1497744000

Sale 8:

Bulk for Death at Dusk Hong Kong Cone

Seller: https://backpack.tf/profiles/76561198071197720#!/compare/1497744000/1497830400

Buyer: https://backpack.tf/profiles/76561198103001146#!/compare/1497744000/1497830400

Sale 9:

Bulk for Frostbite Cotton Head

Seller: https://backpack.tf/profiles/76561198103001146#!/compare/1497744000/1497830400

buyer: https://backpack.tf/profiles/76561198190577279#!/compare/1497744000/1497830400

Sellers:

22 keys:

http://i.imgur.com/e9cH7qJ.png

24 keys:

http://i.imgur.com/yjKj5l3.png - 2 days

25 keys:

http://i.imgur.com/hLbxgfX.png

No notes:

http://www.tf2outpost.com/trade/29330703

Sales at:

15

18

21

24

18 quicksold, and 15 probably went to a buy order, and is currently countered by buy orders. Excluding 18 and 15.

Going with 21-24.