Update!

Sale 1: https://backpack.tf/profiles/76561198021055079#!/compare/1592179200/1592265600

https://backpack.tf/profiles/76561198052736868#!/compare/1592179200/1592265600

24 pure.

Sale 2: https://backpack.tf/profiles/76561198052736868#!/compare/1593734400/1593820800

https://backpack.tf/profiles/76561198869102869#!/compare/1593043200/1593820800

?

Sale 3: https://backpack.tf/profiles/76561198869102869#!/compare/1593820800/1593993600

https://backpack.tf/profiles/76561198002757046#!/compare/1593734400/1593820800

Bulk.

Sale 4: https://backpack.tf/profiles/76561198002757046#!/compare/1593993600/1594080000

https://backpack.tf/profiles/76561198097972401#!/compare/1593820800/1594080000

?

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Credits to Lemons:

Some more sales have happened:

https://backpack.tf/profiles/76561198337734785#!/compare/1598054400/1598140800

https://backpack.tf/profiles/76561198057886864#!/compare/1598054400/1598140800 - Untrace

https://backpack.tf/profiles/76561198063801454#!/compare/1597363200/1597449600

https://backpack.tf/profiles/76561198337734785#!/compare/1597363200/1597449600 - Buy order for keys, keys for pom

https://backpack.tf/profiles/76561198340634356#!/compare/1597276800/1597363200

https://backpack.tf/profiles/76561198063801454#!/compare/1582329600/1597363200 - Sold for 18 keys, IDs don't work on the compare but the histories match https://backpack.tf/item/5010127267

https://backpack.tf/profiles/76561198097972401#!/compare/1594425600/1595548800

https://backpack.tf/profiles/76561198340634356#!/compare/1596412800/1596499200 - Buy order

Considering that Zol still has one listed, a month later, now at 18.5 keys - https://gyazo.com/abb827c764e22de792af2e64044c1e94 https://backpack.tf/item/3147452797 and the number of sales to buy orders I would probably go with 18 flat and call 24 too high here.

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Id agree, 18 flat.