Re-suggestion from the old one.

Item: https://backpack.tf/item/263052634

Sale #1

https://backpack.tf/profiles/76561198156255538#!/compare/1601683200/1601769600

https://backpack.tf/profiles/76561198088128442#!/compare/1600387200/1601856000

Untraceable

Sale #2

https://backpack.tf/profiles/76561198156255538#!/compare/1606435200/1606521600

Sold for Circling Heart Dragonborn Helmet (active suggestion at 24 Keys) + 8 Keys and 29 ref (0.5 Key), rounding to 9 Keys

24 + 9 = 33 Keys [29 ref was 0.5 key. Keys were lower back then]

sale 2 had a b/o of 29 keys: https://bot.tf/stats/listings/MN7D2V53

Sold for 29 Keys

Sale #3

https://backpack.tf/profiles/76561198060589954#!/compare/1606435200/1606521600

https://backpack.tf/profiles/76561198059661066#!/compare/1606521600/1606608000

Sold for Green Confetti Bumble Beenie (16 Keys) + Searing Plasma Pom-Pommed Provocateur (14.5 Keys) + 6 Keys

16 + 14.5 + 6 = 36.5, rounding to 37 Keys

Sale #4

https://backpack.tf/profiles/76561198346243193#!/compare/1603843200/1606608000

Untraceable here, but...

https://backpack.tf/profiles/76561198287738105#!/compare/1606521600/1606608000

When digging into the Disco Beat Down Warhood item history there, it was sold for 17 Keys [ID match: 9523975363]

So 39 keys - 17 keys from the "items removed" = 22 Keys

Sold for 22 Keys

Sale #5

https://backpack.tf/profiles/76561198060589954#!/compare/1609459200/1609545600

https://backpack.tf/profiles/76561198087806226#!/compare/1609459200/1609545600

Sold for 27 Keys

Marketplace sales

Item: https://marketplace.tf/items/tf2/107;5;u8

49/1.85 = 26.49 keys, rounding to 26 Keys [Oct 4]

50.96/1.85 = 27.55 keys, rounding to 28 Keys [Oct 24]

37/1.81 = 20.44 keys, rounding to 20 keys [Nov 8]

Summary

Sales at

20 Keys

22 Keys

26 Keys

27 Keys

28 Keys

29 Keys

37 Keys

Conclusion

I'd go with 26-29 keys here.