Re-suggesting, using sales from the last suggestion. No new sales have occurred since.

Sale 1:

Sold for $68 on Marketplace.tf

https://marketplace.tf/items/463;5;u3007

68/1.97 = ~34.5

X = 35

Sale 2:

Sold for Spec. KS Aussie Scattergun (~25)

Seller: https://backpack.tf/profiles/76561198095407289#!/compare/1524441600/1524528000

Buyer: https://backpack.tf/profiles/76561198277149114#!/compare/1524268800/1524528000

X = 25

Sale 3:

Sold for Neutron Star Old Guadalajara (25)

No outpost

Seller: https://backpack.tf/profiles/76561198277149114#!/compare/1524528000/1524960000

Buyer: https://backpack.tf/profiles/76561198263938120#!/compare/1524787200/1524960000

X = 25

Sale 4:

Sold for 15 keys

Seller: https://backpack.tf/profiles/76561198344933095#!/compare/1523750400/1523836800

Buyer: https://backpack.tf/profiles/76561198070664972#!/compare/1523750400/1523836800

Bot.tf confirms: https://i.imgur.com/2Y4RAKQ.png

X = 15

Sale 5:

Sold for 10 keys (Buyer’s compare link)

Seller: https://backpack.tf/profiles/76561198313769156#!/compare/1524355200/1524441600

Buyer: https://backpack.tf/profiles/76561198095407289#!/compare/1524355200/1524441600

X = 10

Sellers:

19 keys:

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

https://backpack.tf/item/5390412527

https://backpack.tf/item/3888473092

20 keys:

https://i.imgur.com/f4LDIs3.png

https://backpack.tf/item/6665674987

47 keys:

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

https://backpack.tf/item/2668478388

And a SCM seller for ~20 keys worth:

https://i.imgur.com/RDma7EE.png

Sales at:

10

15

25 (2x)

35

10 looks kinda low, and is pretty close to quickbuyers. Excluding 10.

Several sellers at 19-20, excluding anything higher.

Going with 15 flat.