https://backpack.tf/profiles/76561198341171690#!/compare/1586217600/1586304000

https://backpack.tf/profiles/76561198176022675#!/compare/1586217600/1586304000

https://backpack.tf/item/8059188120

most likely 19 keys + 19 ref

https://i.imgur.com/3XObT92.png - labelled as that here. sold to a gambler, looks like. histories don't match (probs because it was gambled before being scanned in their backpack), but we can see exactly 19 keys and 19 ref on the seller's end so this should be fine to use.

https://backpack.tf/profiles/76561198799983169#!/compare/1586476800/1586563200

https://backpack.tf/profiles/76561198850274253#!/compare/1586476800/1586563200

untraceable

New sales on marketplace:

https://marketplace.tf/items/tf2/538;5;u12

$35.32, April 8th, can't find the histories

https://manic.tf/keyprice/?at=2020-04-08&price=35.32 - $35.32 / $1.69 = 20.90 keys

so new sales at 19 and 21

may be better to exclude 22 due to the 4 month unsold at 21, and go with 19-21, but this might be close enough. up to a mod to decide.

also in the future you'll need to prove bot.tf sales like you did with the 1st one here, otherwise you can't use them, unless there are 3 sales at a certain value.

Given the unproven bot.tf sales I don't think I can go for a "close enough".

19-21 should be appropiate as Jarool said above.