Sale 1:

https://backpack.tf/profiles/76561198303596506#!/compare/1566345600/1566604800

https://backpack.tf/profiles/76561198362008411#!/compare/1566518400/1566604800

Bulk

sale 2:

https://backpack.tf/profiles/76561198362008411#!/compare/1566950400/1567036800

https://backpack.tf/profiles/76561198306211537#!/compare/1566950400/1567036800

Untrace

Sale 3:

https://backpack.tf/profiles/76561198306211537#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198316071886#!/compare/1567123200/1567209600

Untrace

sale 4:

https://backpack.tf/profiles/76561198957454585#!/compare/1563148800/1564790400

https://backpack.tf/profiles/76561198087795898#!/compare/1564531200/1564617600

https://backpack.tf/profiles/76561198081793950#!/compare/1564531200/1564617600

https://backpack.tf/profiles/76561198415525729#!/compare/1564531200/1564617600

Untrace

sale 5:

https://backpack.tf/profiles/76561198415525729#!/compare/1564704000/1564790400

https://backpack.tf/profiles/76561198287738105#!/compare/1564704000/1564790400

Sold for ~15 keys

Sale 6:

https://backpack.tf/profiles/76561198287738105#!/compare/1564790400/1564876800

https://backpack.tf/profiles/76561198419294613#!/compare/1564790400/1564876800

https://backpack.tf/profiles/76561198263801172#!/compare/1564790400/1564876800

https://backpack.tf/profiles/76561198050745352#!/compare/1564790400/1564876800

Bulk, untrace(keys?), bulk, bulk

Sale 7:

https://backpack.tf/profiles/76561198113940534#!/compare/1558828800/1564444800

https://backpack.tf/profiles/76561198121504335#!/compare/1567036800/1567123200

SCM

sale 8:

https://backpack.tf/profiles/76561198390601788#!/compare/1562198400/1564099200

https://backpack.tf/profiles/76561198026129220#!/compare/1566518400/1566777600

Untrace

Sale 9:

https://backpack.tf/profiles/76561198098750965#!/compare/1564099200/1566518400

https://backpack.tf/profiles/76561198056086416#!/compare/1566432000/1566518400

Keys

sale 10:

https://backpack.tf/profiles/76561198432461884#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198340829257#!/compare/1568764800/1568851200

Untrace, sales before this are gambling

Sale 11:

https://backpack.tf/profiles/76561198340829257#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198007378734#!/compare/1569110400/1569196800

Sold for 15 keys

Sale 12:

https://backpack.tf/profiles/76561198007378734#!/compare/1569110400/1569196800

https://backpack.tf/profiles/76561198080179568#!/compare/1569110400/1569196800

https://backpack.tf/profiles/76561198374786138#!/compare/1569024000/1569196800

Untrace

Sale 13 - 16:

https://marketplace.tf/items/tf2/30334;5;u58

$26 / $1.80 = 14.44 keys

$12 / $1.82 = 6.59 keys

$28.99 / $1.82 = 15.93 keys <-- https://backpack.tf/item/7956584205

$25 / $1.82 = 13.74 keys

Total sales @:

6.59, 13.74, 14.44, 15, 15, 15.93 keys

unsold for week + for 15 keys,

buyers up to 8 keys,

https://i.imgur.com/jiJ44cy.png

taking 14 - 15 keys.