Sale 1:

https://backpack.tf/profiles/76561198825748033#!/compare/1588118400/1588204800

https://backpack.tf/profiles/76561198052772297#!/compare/1587945600/1588204800

Bulk

sale 2:

https://backpack.tf/profiles/76561197984765565#!/compare/1586736000/1587772800

https://backpack.tf/profiles/76561198037711232#!/compare/1587859200/1588032000

Untrace

sale 3:

https://backpack.tf/profiles/76561198037711232#!/compare/1588723200/1588809600

https://backpack.tf/profiles/76561198063640894#!/compare/1588636800/1588723200

Bulk

sale 4:

https://backpack.tf/profiles/76561198046845295#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198406818535#!/compare/1589241600/1589328000

Sod for ~21 keys

sale 5:

https://backpack.tf/profiles/76561198406818535#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198095697847#!/compare/1589328000/1589414400

Sold for 19 keys

Sale 6:

https://backpack.tf/profiles/76561198095697847#!/compare/1589414400/1589846400

https://backpack.tf/profiles/76561198132692208#!/compare/1589760000/1589846400

Sold for ~23 keys

sale 7:

https://backpack.tf/profiles/76561198132692208#!/compare/1589760000/1589846400

https://backpack.tf/profiles/76561198188639765#!/compare/1589760000/1589846400

Sold for KaW Herald + 10 keys

Herald Mini:

https://backpack.tf/suggestion/5ec457dcb8d3c5168e2f92ba

Suggestion for 13 keys

Total is 23 keys

sale 8:

https://backpack.tf/profiles/76561198065759867#!/compare/1586217600/1586563200

https://backpack.tf/profiles/76561198859721638#!/compare/1586563200/1586649600

Untrace

sale 9:

https://backpack.tf/profiles/76561198859721638#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198223881088#!/compare/1587427200/1587513600

Sold for Aces Cane + 20 keys

nothing on the cane

sale 10:

https://backpack.tf/profiles/76561198223881088#!/compare/1588291200/1588464000

https://backpack.tf/profiles/76561198216561389#!/compare/1588377600/1588464000

Sold for Isotope Forest WW Flame + 3 keys

use there

sale 11:

https://backpack.tf/profiles/76561198216561389#!/compare/1588377600/1588464000

https://backpack.tf/profiles/76561198323733331#!/compare/1588377600/1588464000

Sold for ~28 keys

Sale 12:

https://backpack.tf/profiles/76561198323733331#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198099141522#!/compare/1588464000/1588550400

Bulk

Sale 13:

https://backpack.tf/profiles/76561198099141522#!/compare/1588723200/1588809600

https://backpack.tf/profiles/76561198347609133#!/compare/1588723200/1588809600

Sold for 20 keys (might wanna double check)

Sale 14:

https://marketplace.tf/items/tf2/15057;15;u703;w3;pk57;kt-2

$33.33 / $1.69 = 19.72 keys <--- https://backpack.tf/item/6936643899

Sale 15, 16:

https://marketplace.tf/items/tf2/15057;15;u703;w3;pk57

$47.49 / $1.78 = 26.68 keys

$49.99 / $1.88 = 26.59 keys

Total sales @:

19, 20, 20, 21, 23, 23, 27, 27, 28 keys

https://backpack.tf/classifieds?page=4&item=Rocket%20Launcher&quality=15&tradable=1&craftable=1&australium=-1&particle=703&killstreak_tier=0

Buyers up to 21 keys,

seller at 26 keys, new,

https://i.imgur.com/AfiIpXp.jpg

taking 23 - 28 keys.