Sale 1:

https://backpack.tf/profiles/76561198053911511#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198013127982#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198341171690#!/compare/1589155200/1589241600

Bulk / QS

sale 2:

https://backpack.tf/profiles/76561198850274253#!/compare/1590105600/1590192000

https://backpack.tf/profiles/76561198947675645#!/compare/1592611200/1592956800

https://backpack.tf/profiles/76561198215947584#!/compare/1585612800/1596067200

Untrace

sale 3:

https://backpack.tf/profiles/76561198283133386#!/compare/1563062400/1590969600

https://backpack.tf/profiles/76561198309832044#!/compare/1591056000/1593820800

Untrace / Bulk

Sale 4:

https://backpack.tf/profiles/76561198850274253#!/compare/1590192000/1590278400

https://backpack.tf/profiles/76561198124723591#!/compare/1590192000/1590278400

https://backpack.tf/profiles/76561198176375567#!/compare/1590192000/1590278400

https://backpack.tf/profiles/76561198176375567#!/compare/1590278400/1593216000

https://backpack.tf/profiles/76561198078018027#!/compare/1590278400/1590364800

Untrace / QS / Bulk

sale 5:

https://backpack.tf/profiles/76561198078018027#!/compare/1590278400/1590451200

https://backpack.tf/profiles/76561198162008465#!/compare/1589500800/1590451200

Untrace

sale 6:

https://backpack.tf/profiles/76561198048851745#!/compare/1596240000/1596844800

https://backpack.tf/profiles/76561198199962018#!/compare/1554336000/1596844800

Sold for ~6 keys

sale 7:

https://backpack.tf/profiles/76561198199962018#!/compare/1554336000/1596844800

https://backpack.tf/profiles/76561198371559210#!/compare/1596758400/1596844800

Sold for ~6.5 keys

sale 8:

https://backpack.tf/profiles/76561198371559210#!/compare/1596844800/1596931200

https://backpack.tf/profiles/76561198150850624#!/compare/1596844800/1596931200

Untrace

sale 9:

https://backpack.tf/profiles/76561198150850624#!/compare/1596844800/1596931200

https://backpack.tf/profiles/76561198983255976#!/compare/1596844800/1596931200

https://backpack.tf/profiles/76561198358296372#!/compare/1596844800/1596931200

Untrace

sale 10:

https://backpack.tf/profiles/76561198337734785#!/compare/1596672000/1596758400

https://backpack.tf/profiles/76561198126695508#!/compare/1596672000/1596758400

Bulk

sale 11:

https://backpack.tf/profiles/76561198337734785#!/compare/1590019200/1590105600

https://backpack.tf/profiles/76561198393307663#!/compare/1589673600/1590105600

Untrace

sale 12:

https://backpack.tf/profiles/76561198393307663#!/compare/1589673600/1590105600

https://backpack.tf/profiles/76561198140935870#!/compare/1589932800/1590105600

Bulk / use there

sale 13:

https://backpack.tf/profiles/76561198140935870#!/compare/1590105600/1590192000

https://backpack.tf/profiles/76561198011827547#!/compare/1590019200/1590105600

Sold for ~6.5 keys (4 used to buy Hallmark)

sale 14:

https://backpack.tf/profiles/76561198011827547#!/compare/1590019200/1590105600

https://backpack.tf/profiles/76561198077929459#!/compare/1590019200/1590105600

https://backpack.tf/profiles/76561198382290208#!/compare/1590019200/1590105600

Untrace / QS

sale 15:

https://marketplace.tf/items/tf2/613;5;u59

$13 / $1.91 = 6.81 keys

$13.49 / $2.01 = 6.71 keys

$14.54 / $2.00 = 7.27 keys

$14.49 / $2.04 = 7.10 keys

$13.49 / $1.86 = 7.25 keys

Total sales @:

6, 6.5, 6.5, 6.5, 7, 7, 7.5, 7.5 keys

buyer at 6 is high,

average buyers more at ~5.5 keys,

seller at 8 keys, newly listed:

https://backpack.tf/item/7955990279

taking 6 - 7.5 keys.