I'm shit at unu suggs.

Mini for Purple Confetti White Russian.

Sale 1:

https://backpack.tf/profiles/76561198140316312#!/compare/1623974400/1624060800

https://backpack.tf/profiles/76561198328980949#!/compare/1623974400/1624147200

Untrace/dunno

Sale 2:

https://backpack.tf/profiles/76561198328980949#!/compare/1624147200/1624752000

https://backpack.tf/profiles/76561198850121720#!/compare/1623974400/1624320000

Untrace/bulk

Sale 3:

https://backpack.tf/profiles/76561198331033888#!/compare/1587600000/1627257600

https://backpack.tf/profiles/76561198850121720#!/compare/1625616000/1625788800

No idea

Sale 4:

https://backpack.tf/profiles/76561198869081808#!/compare/1622678400/1627257600

https://backpack.tf/profiles/76561199107865875#!/compare/1627171200/1627257600

dunno help

Sale 5:

https://backpack.tf/profiles/76561198062098057#!/compare/1627430400/1627516800

https://backpack.tf/profiles/76561199107865875#!/compare/1627430400/1627516800

sigh idk

Sale 6:

https://backpack.tf/profiles/76561199102199351#!/compare/1629158400/1629244800

bulk

Sale 7:

https://imgur.com/a/HpXqRuy

26k

Comment left by Lemons:

Sale 1 was 30 keys https://backpack.tf/profiles/76561198140316312#!/compare/1624060800/1624147200

Worth noting sale 3 did have a buyout of 25 keys https://gladiator.tf/listings/60e5df72c9a2a2f5efd5650d

Sale 4 was via buy order, likely to be ~24 keys https://gladiator.tf/sales?item=Miami%20Nights%20One-Man%20Army&at=2021-09-03T11:59:16.416Z

Which means sale 5 was probably ~26 keys https://gladiator.tf/sales?item=Miami%20Nights%20One-Man%20Army&at=2021-09-03T11:59:16.416Z

So as sales go we have:

24, 25?, 26, 26 and 30

Since 30 got dumped to quicksell.store I would exclude it, it's also above other sales and the unsold that you pointed out

I can see 24 - 26 working here