Suggestion 42. Squad 1.

Sales

1:1 Green Confetti Bone Dome

https://backpack.tf/profiles/76561198431200759#!/compare/1602374400/1602460800

https://backpack.tf/profiles/76561198095174547#!/compare/1602374400/1602460800

No recent sale for GFetti Bone Dome, can use there.

Sold for Orbiting Planets Das Maddendoktor

https://backpack.tf/profiles/76561198431200759#!/compare/1605312000/1605398400

https://backpack.tf/profiles/76561198069493147#!/compare/1605312000/1605398400

No usable sales on Orb Planets Das Maddendoktor, can use there.

Bubbling Soldier's Slope Scopers(10.5) + 2.79 Keys in sweets

https://backpack.tf/profiles/76561198069493147#!/compare/1605398400/1605484800

https://backpack.tf/profiles/76561198141057220#!/compare/1605484800/1605571200

Rounding this into 13 Keys

Sold with 1 key for Orbiting Planets Warhood(11) + Pro KS Kit Syringe Gun(1.69)

11 + 1.69 - 1 = 11.69

https://backpack.tf/profiles/76561198069493147#!/compare/1607731200/1607817600

https://backpack.tf/profiles/76561198141057220#!/compare/1607212800/1607817600

Rounding this into 12 Keys

Untrace

https://backpack.tf/profiles/76561198069493147#!/compare/1607904000/1607990400

https://backpack.tf/profiles/76561198078830307#!/compare/1606176000/1608249600

Marketplace sales

https://marketplace.tf/items/tf2/95;5;u32

October 28: $22.99 / $1.84 = 12.49 keys(12)

Summary

Sales at 12, 12, and 13

Conclusion

Going with 12-13 here.