Sale 1:

Sold for Max’s (18) + Green Confetti Brain Bucket (Suggestion at 13)

No outpost

Seller: https://backpack.tf/profiles/76561198004415658#!/compare/1502582400/1502668800

Buyer: https://backpack.tf/profiles/76561198196685086#!/compare/1502582400/1502755200

X = 31

Sale 2:

Sold for DBD Titanium Pillar (33) + 1 key

https://i.imgur.com/lpKWlLE.png - B/O of 30

Seller: https://backpack.tf/profiles/76561198153806405#!/compare/1506643200/1506729600

Buyer: https://backpack.tf/profiles/76561198339075417#!/compare/1506643200/1506729600

X = 30 (Capped by B/O)

Sale 3:

Sold for 27 keys + 16 ref

http://www.tf2outpost.com/trade/29369923 - B/O of 30

Seller: https://backpack.tf/profiles/76561198232041512#!/compare/1505520000/1505606400

Buyer: https://backpack.tf/profiles/76561198141472321#!/compare/1504742400/1505865600

X = 27

Sale 4:

Sold with 7 keys for Vivid Noble (In-date at 36, 10 day old seller at 30, taking 33)

No outpost

Seller: https://backpack.tf/profiles/76561198329708645#!/compare/1505779200/1506038400

Buyer: https://backpack.tf/profiles/76561198153806405#!/compare/1505606400/1506038400

X = 26

Sale 5:

Bulk for Scorching Sultan’s Ceremonial

Seller: https://backpack.tf/profiles/76561198063973837#!/compare/1503273600/1503360000

Buyer: https://backpack.tf/profiles/76561198150448445#!/compare/1503273600/1503360000

Sale 6:

Bulk for Strange Unusual Shotgun

Seller: https://backpack.tf/profiles/76561198228083800#!/compare/1500076800/1500163200

Buyer: https://backpack.tf/profiles/76561198052803733#!/compare/1499990400/1500163200

Sale 7:

Bulk for Bonzo Honcho’s

Seller: https://backpack.tf/profiles/76561198055617854#!/compare/1505433600/1505520000

Buyer: https://backpack.tf/profiles/76561198232041512#!/compare/1505433600/1505520000

Sale 8:

Sold with ~1 key in ref for Frostbite Firewall Helmet

Seller: https://backpack.tf/profiles/76561198145926906#!/compare/1503792000/1503878400

Buyer: https://backpack.tf/profiles/76561198055617854#!/compare/1503792000/1503878400

Was used on the Firewall, can’t be used here.

Sale 9:

Sold with ~3 keys in items for Ooze Tricorne

Seller: https://backpack.tf/profiles/76561198141472321#!/compare/1506124800/1506211200

Buyer: https://backpack.tf/profiles/76561198116258680#!/compare/1506124800/1506211200

Should be used on the Tricorne

Sellers:

26 keys:

https://i.imgur.com/wLTOiBj.png - 2 days

27 keys:

https://i.imgur.com/famjKnu.png - 15 days

30 keys:

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

Sales at:

26

27

30

31

Going with 26-31.