Resuggestion, thanks to Xergoyf for the info!

Sale 1:

https://backpack.tf/profiles/76561198049088202#!/compare/1588982400/1589328000

https://backpack.tf/profiles/76561198148511293#!/compare/1589241600/1589328000

Bulk

sale 2:

https://backpack.tf/profiles/76561198148511293#!/compare/1590451200/1590537600

https://backpack.tf/profiles/76561198919096070#!/compare/1590105600/1590537600

Sold for 27 keys

sale 3:

https://backpack.tf/profiles/76561198919096070#!/compare/1590537600/1590624000

https://backpack.tf/profiles/76561198418828410#!/compare/1590537600/1590624000

can trace a fab? maybe keys, but can't trace anything....

sale 4:

https://backpack.tf/profiles/76561198418828410#!/compare/1590624000/1590710400

https://backpack.tf/profiles/76561198021228339#!/compare/1590624000/1590710400

Sold for 25 keys

Sale 5:

https://backpack.tf/profiles/76561198021228339#!/compare/1590710400/1590796800

https://backpack.tf/profiles/76561198047431527#!/compare/1590710400/1590796800

Sold for Steaming TC + ~1 key in sweets

TC Mini:

https://backpack.tf/suggestion/5f31041bae6c3b32727affbe

Suggestion for 33 keys

Total is 34 keys

sale 6:

https://backpack.tf/profiles/76561198263127566#!/compare/1589414400/1590019200

https://backpack.tf/profiles/76561198044934255#!/compare/1590019200/1590192000

Untrace

sale 7:

https://marketplace.tf/items/tf2/30066;5;u34

$38.6 / $1.87 = 20.64 keys

sale 8:

https://backpack.tf/item/7498823051

https://backpack.tf/profiles/76561198830746068#!/compare/1590278400/1590796800

https://i.imgur.com/5vhzrwV.png

Sold for 28 keys, bot.tf confirms.

Total sales @:

21, 25, 27, 28, 34 keys

buyers up to ~23 keys,

https://i.imgur.com/k6DQRsc.png

new seller for 32 keys,

months unsold for 42 keys,

calling 21 low,

34 high,

Xergoyf’s Part:

hmmm 25 sold ~2.5 hours after obtaining judging by the history https://backpack.tf/item/8692672125

Id probably go for a more conservative drop of 27 - 28.