Sale 1:

https://backpack.tf/profiles/76561197995200743#!/compare/1564617600/1566259200

https://backpack.tf/profiles/76561198035334988#!/compare/1565568000/1565654400

Untrace

Sale 2:

https://backpack.tf/profiles/76561198083789250#!/compare/1566172800/1566259200

https://backpack.tf/profiles/76561197964546925#!/compare/1566086400/1566172800

SCM

Sale 3:

https://backpack.tf/profiles/76561198039731024#!/compare/1566172800/1566259200

https://backpack.tf/profiles/76561198398063696#!/compare/1566172800/1566259200

Untrace

Sale 4:

https://backpack.tf/profiles/76561198398063696#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198058827008#!/compare/1567209600/1567296000

Sold in bulk? i think...

Sale 5:

https://backpack.tf/profiles/76561198058827008#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198075505769#!/compare/1567296000/1567382400

Sold for KaW Tipped

Tipped Mini:

https://backpack.tf/suggestion/5d77534267807233d617567d

Suggestion for 23 keys

Sale 6:

https://backpack.tf/profiles/76561198075505769#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198423334519#!/compare/1567296000/1567382400

Sold with 3 keys for CTFL Warmup

Warmup Mini:

https://backpack.tf/suggestion/5d93bb14d3817248652f3b5e

Suggestion for 19.5 keys

Total is 16.5 keys

Sale 7:

https://backpack.tf/profiles/76561198059353114#!/compare/1568764800/1569369600

https://backpack.tf/profiles/76561198057747574#!/compare/1569283200/1569369600

Sold for Searing Bottle Cap

use there

Sale 8:

https://backpack.tf/profiles/76561198026129220#!/compare/1569196800/1569283200

https://backpack.tf/profiles/76561198095862827#!/compare/1569283200/1569369600

untrace

Sale 9:

https://backpack.tf/profiles/76561198095862827#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198378703532#!/compare/1569283200/1569369600

Sold for 17 keys

Sale 10:

https://backpack.tf/profiles/76561198423334519#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198183084561#!/compare/1568764800/1568851200

Sold for Blizzardy Cannonball + ~2 keys in sweets

Cannonball Mini:

https://backpack.tf/suggestion/5d93ec92d3817260c0522f12

Suggestion for 17.5 keys

Total is 19.5 keys

Sale 11:

https://backpack.tf/profiles/76561198183084561#!/compare/1568937600/1569024000

https://backpack.tf/profiles/76561198154211785#!/compare/1568937600/1569024000

Sold for 15 keys

Sale 12:

https://backpack.tf/profiles/76561198154211785#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198329023090#!/compare/1569024000/1569110400

Bulk

Sale 13 - 16:

https://marketplace.tf/items/tf2/31042;5;u5

$22 / $1.82 = 12.09 keys

$36 / $1.82 = 19.78 keys <-- https://backpack.tf/item/8015479642

$35.99 / $1.82 = 19.77 keys

$17.05 / $1.82 = 9.37 keys <-- https://backpack.tf/item/7972729957 or 35.99, can't tell.

Total sales @:

9.37, 12.09, 15, 16.5, 17, 19.5, 19.77, 19.78, 23 keys

Buyers up to ~10 keys,

seller for 20 keys,

calling 23 high,

12 and under low,

taking 15 - 20 keys