Sale 1-7:

https://marketplace.tf/items/tf2/31010;5;u112

$19.5 / $1.78 = 10.96 keys // https://backpack.tf/item/7260508661

$19.5 / $1.78 = 10.96 keys // https://backpack.tf/item/7430426479

$12.1 / $1.78 = 6.80 keys

$17.99 / $1.78 = 10.11 keys // https://backpack.tf/item/7245764990

$19.5 / $1.79 = 10.89 keys

$19.5 / $1.78 = 10.96 keys // https://backpack.tf/item/7254772203

$19.5 / $1.78 = 10.96 keys // https://backpack.tf/item/7280032028

Sale 8:

bulk

https://backpack.tf/profiles/76561198038986052#!/compare/1585267200/1585440000

https://backpack.tf/profiles/76561198873410675#!/compare/1585440000/1585872000

Sale 9:

untrace

https://backpack.tf/profiles/76561198813326440#!/compare/1579478400/1579737600

https://backpack.tf/profiles/76561198043936328#!/compare/1579651200/1579737600

Sale 10:

9 keys

https://backpack.tf/profiles/76561198121830870#!/compare/1579910400/1579996800

https://backpack.tf/profiles/76561198050031103#!/compare/1578528000/1580169600

Sale 11:

9 keys + 1 ref

https://backpack.tf/profiles/76561198308772967#!/compare/1580342400/1580428800

https://backpack.tf/profiles/76561198324700619#!/compare/1580342400/1580428800

Sale 12:

bulk

https://backpack.tf/profiles/76561198356223429#!/compare/1580688000/1580774400

https://backpack.tf/profiles/76561198324700619#!/compare/1580688000/1580774400

Sale 13:

8 keys + 30 ref

https://backpack.tf/profiles/76561198356223429#!/compare/1580774400/1580860800

https://backpack.tf/profiles/76561198308772967#!/compare/1580774400/1580860800

Sale 14:

9 keys + 26 ref

https://backpack.tf/profiles/76561198308772967#!/compare/1581379200/1581465600

https://backpack.tf/profiles/76561198095009220#!/compare/1581379200/1581465600

Sale 15:

untrace - possibly SCM

https://backpack.tf/profiles/76561198247125544#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198040106025#!/compare/1584489600/1585008000

Sale 16:

9 keys

https://backpack.tf/profiles/76561198024867201#!/compare/1579305600/1579392000

https://backpack.tf/profiles/76561198420935658#!/compare/1579392000/1581292800

Sale 17:

8 keys + 34 ref

https://backpack.tf/profiles/76561198419855386#!/compare/1584316800/1584489600

https://backpack.tf/profiles/76561198420935658#!/compare/1583971200/1584489600

Sale 18:

untrace

https://backpack.tf/profiles/76561198118922746#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198855892118#!/compare/1582934400/1583020800

many untrace- https://backpack.tf/item/7328444916

Sale 19:

untrace

https://backpack.tf/profiles/76561198270949034#!/compare/1579046400/1579132800

https://backpack.tf/profiles/76561198087838937#!/compare/1579046400/1579132800

Sale 20:

untrace - likely buy order

https://backpack.tf/profiles/76561198087838937#!/compare/1579046400/1579132800

https://backpack.tf/profiles/76561198341171690#!/compare/1579046400/1579132800

Sale 21:

untrace

https://backpack.tf/profiles/76561198341171690#!/compare/1583625600/1583712000

https://backpack.tf/profiles/76561197970537566#!/compare/1582416000/1584662400

Sale 22:

untrace

https://backpack.tf/profiles/76561198069493147#!/compare/1585008000/1585094400

https://backpack.tf/profiles/76561198341171690#!/compare/1585008000/1585094400

===============================================================================

Sales:

7,8.5,8.5,9,9,9,9.5,10,11,11,11,11,11

buyers at 8.7: https://imgur.com/a/6dV5lNZ