Sale 1:

Sold for Planets Private Eye (Suggestion at 11) + 2 keys + cheap cosmetic

No outpost

Seller: https://backpack.tf/profiles/76561198040922869#!/compare/1524960000/1525392000

Buyer: https://backpack.tf/profiles/76561198257103753#!/compare/1525132800/1525392000

X = 13

Sale 2:

Sold for Smoking Bloke’s Bucket Hat (Suggestion at 8.5) + 2 keys

No outpost

Seller: https://backpack.tf/profiles/76561198376331369#!/compare/1521417600/1521504000

Buyer: https://backpack.tf/profiles/76561198102431187#!/compare/1520899200/1521504000

X = 11

Sale 3:

Sold for Strike Proletariat Posedown (7)

Seller: https://backpack.tf/profiles/76561198044782825#!/compare/1520640000/1520726400

Buyer: https://backpack.tf/profiles/76561198332241600#!/compare/1520640000/1520726400

X = 7

Sale 4:

Sold with a key for Bubbling Little Buddy

http://www.tf2outpost.com/trade/29615927 - B/O of 13

Seller: https://backpack.tf/profiles/76561198024373006#!/compare/1523577600/1523664000

Buyer: https://backpack.tf/profiles/76561198040922869#!/compare/1523577600/1523664000

Can be used on the Little Buddy.

Sale 5:

Bulk

Seller: https://backpack.tf/profiles/76561198332241600#!/compare/1520985600/1521072000

Buyer: https://backpack.tf/profiles/76561198182213262#!/compare/1520899200/1521072000

Smoking Bloke’s Bucket Hat:

https://backpack.tf/suggestion/5b02a678cf6c7515750c1cb3

Planets Private Eye:

https://backpack.tf/suggestion/5b02b187cf6c7540f22a4bc1

Sellers:

13 keys:

https://i.imgur.com/95yEx2V.png

https://backpack.tf/item/1737506300 - 2 months

Sales at:

7

11

13

7 is an outlier, excluding.

13 is too high, given the 2 month old seller at 13. Excluding 13.

Going with 11 flat.