Sale 1:

https://backpack.tf/profiles/76561198131452826#!/compare/1586390400/1586476800

https://backpack.tf/profiles/76561198305494036#!/compare/1586390400/1586476800

QS for ~30 keys

Sale 2:

https://backpack.tf/profiles/76561198305494036#!/compare/1586390400/1586476800

https://backpack.tf/profiles/76561198069493147#!/compare/1586390400/1586476800

Sold for keys, at least 30

Sale 3:

https://backpack.tf/profiles/76561198069493147#!/compare/1586476800/1586563200

https://backpack.tf/profiles/76561198017494573#!/compare/1564444800/1586476800

Sold for Vivid Boonie + Max Head(18)

Boonie as inconsistent sales:

https://pastebin.com/kMDjRTjf

not using

Sale 4:

https://backpack.tf/profiles/76561198017494573#!/compare/1586476800/1586563200

https://backpack.tf/profiles/76561199020933297#!/compare/1586476800/1586563200

Untrace

Sale 5:

https://backpack.tf/profiles/76561199020933297#!/compare/1586563200/1586649600

https://backpack.tf/profiles/76561198125815902#!/compare/1585958400/1586649600

Bulk

Sale 6:

https://backpack.tf/profiles/76561198057139045#!/compare/1585958400/1586044800

https://backpack.tf/profiles/76561198337734785#!/compare/1585958400/1586044800

Bulky

Sale 7:

https://backpack.tf/profiles/76561198337734785#!/compare/1586390400/1586476800

https://backpack.tf/profiles/76561198069493147#!/compare/1586390400/1586476800

Keys

Sale 8:

https://backpack.tf/profiles/76561198069493147#!/compare/1586476800/1586563200

https://backpack.tf/profiles/76561198097427947#!/compare/1586476800/1586563200

Sold with 1 key for Scorching Buddy

Buddy Mini:

https://backpack.tf/suggestion/5e97a34a1709f97b4f6e15ad

Suggestion for 40 keys

Total is 39 keys

Sale 9:

https://marketplace.tf/items/tf2/30041;5;u13

$67.99 / $1.69 = 40.23 keys

total sales @:

39, 40 keys

buyers up to ~31 keys,

sellers at 60 keys

Taking 39 - 40 keys