Update!

Sale 1: https://backpack.tf/profiles/76561198850274253#!/compare/1583798400/1583884800

https://backpack.tf/profiles/76561198998858780#!/compare/1583798400/1583884800

Sold for a Terror-Watt War Pig (27 keys)

Sale 2: https://backpack.tf/profiles/76561198998858780#!/compare/1585785600/1585872000

https://backpack.tf/profiles/76561198095022965#!/compare/1585699200/1585785600

Bulk.

Sale 3: https://backpack.tf/profiles/76561198168358562#!/compare/1588809600/1588982400

https://backpack.tf/profiles/76561198396499936#!/compare/1588896000/1588982400

Bulk.

Sale 4: https://marketplace.tf/items/tf2/145;5;u62 - 50/1.69 = ~30

https://backpack.tf/item/7956896251

Sale 5: https://backpack.tf/profiles/76561198095022965#!/compare/1587945600/1588032000

https://backpack.tf/profiles/76561198109756059#!/compare/1556928000/1563667200

https://i.imgur.com/PNtnAUc.gifv - 21 pure.

Classies: https://i.imgur.com/nz4adGR.png. I was at 21 for a while, and there was a seller at 21.

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Additional by Blaze:

new sales:

https://imgur.com/a/TkonZan

https://backpack.tf/profiles/76561198902479382#!/compare/1591315200/1591401600

https://backpack.tf/profiles/76561198024490825#!/compare/1581984000/1591315200 - sold for items seen in first compare + Strange Professional Killstreak Australium Axtinguisher seen in second compare = 22 keys b/o

https://backpack.tf/profiles/76561198396499936#!/compare/1589500800/1589587200

https://backpack.tf/profiles/76561198902479382#!/compare/1589414400/1589587200

https://bot.tf/stats/listings/M19553WX - sold for Hot Killstreak Aqua Marine Rocket Launcher (Field-Tested) = should cap at 21 key b/o

the new sales seem to support a lower price which supports what you said about your sale taking some time to sell for 21.

it is likely that both higher sales were capped at b/o's especially Johan's listing given they usually have lower prices. maybe 21-22 would be better here?

21-22 it is!