Sale 1:

https://backpack.tf/profiles/76561198806117936#!/compare/1586304000/1589500800

https://backpack.tf/profiles/76561198871163068#!/compare/1588550400/1588896000

QS

Sale 2:

https://backpack.tf/profiles/76561198871163068#!/compare/1588896000/1588982400

https://backpack.tf/profiles/76561198080909224#!/compare/1588896000/1588982400

Sold for 26 keys (5 in group of 31 do not match)

sale 3:

https://backpack.tf/profiles/76561198080909224#!/compare/1588896000/1588982400

https://backpack.tf/profiles/76561198097553819#!/compare/1588723200/1589155200

Untrace

sale 4:

https://backpack.tf/profiles/76561198097553819#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198158206236#!/compare/1589155200/1589241600

Bulky

sale 5:

https://backpack.tf/profiles/76561198088812563#!/compare/1587168000/1587340800

https://backpack.tf/profiles/76561198155110999#!/compare/1587168000/1587340800

QS

sale 6:

https://backpack.tf/profiles/76561198080179568#!/compare/1588896000/1588982400

https://backpack.tf/profiles/76561198063837280#!/compare/1588896000/1588982400

Untrace

sale 7:

https://backpack.tf/profiles/76561199013458156#!/compare/1584748800/1584835200

https://backpack.tf/profiles/76561198871444509#!/compare/1584835200/1584921600

Untrace

sale 8:

https://backpack.tf/profiles/76561198871444509#!/compare/1584835200/1584921600

https://backpack.tf/profiles/76561198163131745#!/compare/1584835200/1584921600

Can trace 14 keys

sale 9:

https://backpack.tf/profiles/76561198163131745#!/compare/1584835200/1585094400

https://backpack.tf/profiles/76561198251524922#!/compare/1584921600/1585008000

Sold for 22 keys

sale 10:

https://backpack.tf/profiles/76561198251524922#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198141054773#!/compare/1585267200/1585353600

Bulk for keys

sale 11:

https://backpack.tf/profiles/76561198141054773#!/compare/1585872000/1585958400

https://backpack.tf/profiles/76561198872951544#!/compare/1585872000/1585958400

Untrace

sale 12:

https://backpack.tf/profiles/76561198046762101#!/compare/1586217600/1587513600

https://backpack.tf/profiles/76561198002757046#!/compare/1586131200/1586217600

QS

sale 13:

https://backpack.tf/profiles/76561198002757046#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561198091502579#!/compare/1588377600/1588464000

Untrace

sale 14:

https://backpack.tf/profiles/76561198120385184#!/compare/1581897600/1585267200

https://backpack.tf/profiles/76561198985910282#!/compare/1587254400/1587427200

QS

sale 15:

https://backpack.tf/profiles/76561198985910282#!/compare/1588377600/1588464000

https://backpack.tf/profiles/76561198091502579#!/compare/1588377600/1588464000

Sold for ~25 keys

sale 16:

https://backpack.tf/profiles/76561198114402400#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198129876495#!/compare/1585267200/1585353600

Sold for 30 keys

sale 17:

https://backpack.tf/profiles/76561198821294885#!/compare/1583884800/1583971200

https://backpack.tf/profiles/76561198068910184#!/compare/1583798400/1583971200

Sold for 24 keys

sale 18:

https://backpack.tf/profiles/76561198068910184#!/compare/1584057600/1584144000

https://backpack.tf/profiles/76561197971174166#!/compare/1584057600/1584144000

Bulk

sale 19:

https://backpack.tf/profiles/76561197971174166#!/compare/1584230400/1584316800

https://backpack.tf/profiles/76561198826254247#!/compare/1584230400/1584316800

Bulk

sale 20:

https://backpack.tf/profiles/76561198826254247#!/compare/1584403200/1584489600

https://backpack.tf/profiles/76561198302382325#!/compare/1584403200/1584489600

Sold for 25 keys

sale 21:

https://backpack.tf/profiles/76561198302382325#!/compare/1585612800/1585699200

https://backpack.tf/profiles/76561198050702987#!/compare/1583971200/1585699200

Sold for 31 keys

Sale 22:

https://marketplace.tf/items/tf2/631;5;u58

$59.99 / $1.71 = 35.08 keys

Total sales @:

22, 24, 25, 25, 26, 30, 31, 35 keys

buyers up to ~24 keys,

2 unsolds for around a week at 32 keys,

calling 24 low,

35 high,

taking 25 -31 keys