Sale 1:

https://backpack.tf/profiles/76561198072320444#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561198084109822#!/compare/1567814400/1567900800

Sold for 30 keys

Sale 2:

https://backpack.tf/profiles/76561198210619136#!/compare/1565308800/1565395200

https://backpack.tf/profiles/76561198054862332#!/compare/1565308800/1565481600

Bulk

Sale 3:

https://backpack.tf/profiles/76561198061633463#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198042026035#!/compare/1567814400/1567900800

ends up low

Sale 4:

https://backpack.tf/profiles/76561198042026035#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198129230935#!/compare/1567987200/1568073600

Sold with 18 keys for Aussie Medigun(42)

Total is 24 keys

Sale 5:

https://backpack.tf/profiles/76561198129230935#!/compare/1568678400/1568851200

https://backpack.tf/profiles/76561198335791307#!/compare/1568764800/1568851200

QS

Sale 6:

https://backpack.tf/profiles/76561198032621378#!/compare/1519257600/1563753600

https://backpack.tf/profiles/76561198079628079#!/compare/1564617600/1565136000

Untrace

Sale 7:

https://backpack.tf/profiles/76561198079628079#!/compare/1565136000/1565222400

https://backpack.tf/profiles/76561198340634356#!/compare/1565049600/1565136000

QS

sale 8:

https://backpack.tf/profiles/76561198080060319#!/compare/1565481600/1565654400

https://backpack.tf/profiles/76561198021272428#!/compare/1565568000/1565654400

Bulk

sale 9:

https://backpack.tf/profiles/76561198043991016#!/compare/1563667200/1563840000

https://backpack.tf/profiles/76561198033378852#!/compare/1563580800/1563667200

Bulk

Sale 10:

https://backpack.tf/profiles/76561198033378852#!/compare/1563667200/1563753600

https://backpack.tf/profiles/76561198285371555#!/compare/1563667200/1563753600

Bulk

Sale 11:

https://backpack.tf/profiles/76561198285371555#!/compare/1563840000/1563926400

https://backpack.tf/profiles/76561198076597902#!/compare/1563753600/1563926400

Can only trace 13 keys? seems low.

Sale 12:

https://backpack.tf/profiles/76561198076597902#!/compare/1565654400/1565827200

https://backpack.tf/profiles/76561198040073503#!/compare/1565827200/1565913600

https://backpack.tf/profiles/76561198340634356#!/compare/1565827200/1565913600

Untrace

Sale 13:

https://backpack.tf/profiles/76561198340634356#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561197996041605#!/compare/1566345600/1566518400

Sold for 32 keys

Sale 14:

https://backpack.tf/profiles/76561197996041605#!/compare/1567900800/1569801600

https://backpack.tf/profiles/76561198097271466#!/compare/1568160000/1568246400

QS

Sale 15:

https://backpack.tf/profiles/76561198097271466#!/compare/1569456000/1569542400

https://backpack.tf/profiles/76561198167704967#!/compare/1568937600/1569542400

Sold for 24 keys

Sale 16:

https://backpack.tf/profiles/76561198167704967#!/compare/1569888000/1569974400

https://backpack.tf/profiles/76561198066256810#!/compare/1569801600/1569888000

Sold for Steaming Bonk

Bonk Mini:

https://backpack.tf/suggestion/5d9bda32678072365f52a4c5

Suggestion for 27 keys

Sale 17 - 21:

https://marketplace.tf/items/tf2/1172;5;u3021

$62.99 / $1.81 = 34.80 keys

$59.95 / $1.83 = 32.76 keys <--- https://backpack.tf/item/7255574745 Can't tell which

$37.11 / $1.83 = 20.28 keys <---^

$70 / $1.82 = 38.46 keys <---- https://backpack.tf/item/7045146689, can't tell which

$56 / $1.82 = 30.77 keys <----^

total sales @:

20.88, 24, 27, 30, 30.77, 32, 32.76, 34.80, 38.46 keys

sellers down to 33, 34 keys,

buyers up to 24 keys,

calling 24 and under low,

calling 34.80 + high,

taking 27 - 33 keys.