Sale 1:

Sold for $45 on Marketplace.tf

No outpost

https://marketplace.tf/items/135;5;u29

https://backpack.tf/item/630645862 (not sure if this is the correct one)

45/~22.96

X = 23

Sale 2:

Sold for Galactic Codex Universal Translator (Suggestion at 17) + Australium Axtinguisher (~5)+ 14.33 ref

http://www.tf2outpost.com/trade/29524838

Seller: https://backpack.tf/profiles/76561198096098198#!/compare/1517011200/1517097600

Buyer: https://backpack.tf/profiles/76561198091733579#!/compare/1517011200/1517097600

X = 22

Sale 3:

Sold for Orbiting Fire Noble + 9 keys and some ref

http://www.tf2outpost.com/trade/29481316 - B/O of 21

Seller: https://backpack.tf/profiles/76561198166763414#!/compare/1515110400/1515196800

Buyer: https://backpack.tf/profiles/76561198028274426#!/compare/1514851200/1515196800

easily caps.

X = 21 (Capped by B/O)

Sale 4:

Sold with some ref for 20 keys

Seller: https://backpack.tf/profiles/76561198061376237#!/compare/1514160000/1514246400

Buyer: https://backpack.tf/profiles/76561198310537468#!/compare/1514246400/1514332800

X = 20

Sale 5:

Sold for 20 keys (Buyer’s compare link) in a day

Seller: https://backpack.tf/profiles/76561198091733579#!/compare/1517097600/1517184000

Buyer: https://backpack.tf/profiles/76561198171325534#!/compare/1516924800/1517184000

X = 20

Sale 6:

Sold with 2 keys for Kill-a-Watt Powdered Practitioner

Seller: https://backpack.tf/profiles/76561198310537468#!/compare/1515110400/1515196800

Buyer: https://backpack.tf/profiles/76561198096098198#!/compare/1514937600/1515110400

Better used on the Practitioner

Sale 7:

Sold for either an Aussie Medigun or at least 19 keys

Seller: https://backpack.tf/profiles/76561198002757046#!/compare/1510704000/1510790400

Buyer: https://backpack.tf/profiles/76561198290567969#!/compare/1510704000/1510790400

Couldn’t tell which one is correct, so I’m gonna leave this one out.

Sale 8:

Bulk for Cloud 9 Cold Killer

Seller: https://backpack.tf/profiles/76561198079468968#!/compare/1512691200/1512777600

Buyer: https://backpack.tf/profiles/76561198134266699#!/compare/1512691200/1512777600

Galactic Codex Universal Translator:

https://backpack.tf/suggestion/5a76dadfcf6c757ed275c132

Sellers:

https://i.imgur.com/4Q7LSJU.png

~22.65 keys:

https://backpack.tf/item/670076622

23 keys:

https://backpack.tf/item/630645862

Sales at:

20 (2x)

21

22

23

Gonna assume that quicksale at 20 was just a lucky sale, all the other sales are not far off of it.

Going with 20-23.