Sale 1:

Sold for Bubbling Well-Rounded Rifleman (Mini at 31 below) + ~18 keys in Strange weapons

No outpost

Seller: https://backpack.tf/profiles/76561198173442901#!/compare/1503964800/1504051200

Buyer: https://backpack.tf/profiles/76561198113394590#!/compare/1503964800/1504051200

X = 49

Sale 2:

Sold for Darkblaze Bootleg Base Metal Billycock (40)

No outpost

Seller: https://backpack.tf/profiles/76561198192602363#!/compare/1507939200/1508025600

Buyer: https://backpack.tf/profiles/76561198154537737#!/compare/1507939200/1508025600

X = 40

Sale 3:

Sold for $76.50 on Marketplace.tf

https://marketplace.tf/items/538;5;u59

https://backpack.tf/item/5783210277 (might not be this one)

76.5/1.93 = ~39.6

X = 40

Sale 4:

Sold for Killstreak Aussie Knife (17.5) + Dead Head (13.5) + Strange Pro. KS Festive Revolver (4)

No outpost

Seller: https://backpack.tf/profiles/76561198133029091#!/compare/1503878400/1504051200

Buyer: https://backpack.tf/profiles/76561198126571115#!/compare/1503964800/1504051200

X = 35

Sale 5:

Sold for 34 keys

No outpost

Seller: https://backpack.tf/profiles/76561198179707937#!/compare/1506729600/1506816000

Buyer: https://backpack.tf/profiles/76561198084689529#!/compare/1506643200/1506816000

X = 34

Sale 6:

Sold for 30 keys in a day

No outpost

Seller: https://backpack.tf/profiles/76561198296062531#!/compare/1504137600/1504224000

Buyer: https://backpack.tf/profiles/76561198103607562#!/compare/1504137600/1504915200

X = 30

Sale 7:

Quicksold for 27 keys

http://www.tf2outpost.com/trade/29337042 - B/O of 27

Seller: https://backpack.tf/profiles/76561198309937181#!/compare/1503100800/1503187200

Buyer: https://backpack.tf/profiles/76561198205939253#!/compare/1503100800/1503187200

X = 27

Sale 8:

Sold for 27 keys

No outpost

Seller: https://backpack.tf/profiles/76561198211674749#!/compare/1503705600/1503792000

Buyer: https://backpack.tf/profiles/76561198037137394#!/compare/1503705600/1503792000

X = 27

Sale 9:

Bulk for Vivid HKC

Seller: https://backpack.tf/profiles/76561198037137394#!/compare/1503878400/1504051200

Buyer: https://backpack.tf/profiles/76561198173442901#!/compare/1503964800/1504051200

Sale 10:

Bulk for Beams Samur-Eye

Seller: https://backpack.tf/profiles/76561198089291231#!/compare/1501804800/1501891200

Buyer: https://backpack.tf/profiles/76561198200149725#!/compare/1501804800/1501891200

Bubbling Well-Rounded Rifleman Mini:

Sold for Max’s (18) + 13 keys in pure/items

No outpost

Seller: https://backpack.tf/profiles/76561198171521638#!/compare/1503619200/1503705600

Buyer: https://backpack.tf/profiles/76561198113394590#!/compare/1503532800/1503705600

X = 31

Sellers:

35 keys:

https://i.imgur.com/mQXVf0B.png - 4 days, definitely lowered/re-listed

https://backpack.tf/item/2416126423

https://i.imgur.com/J1lIgeJ.png - 9 days

37 keys:

https://i.imgur.com/4Prf5sA.png - 3 months, definitely lowered/re-listed

https://backpack.tf/item/5307958057

Sales at:

27 (2x)

30

34

35

40 (2x)

49

Sales at 27 and 30 quicksold/went to quickbuyers. Excluding 27 and 30.

Seller at 37 keys, has been selling for quite a while. Excluding 40 and 49.

Going with 34-35.