Sale 1:

https://backpack.tf/profiles/76561198170190173#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561197994697258#!/compare/1567814400/1567900800

Bulk

Sale 2:

https://backpack.tf/profiles/76561197964171516#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198288997457#!/compare/1566691200/1566777600

Sold for 24 keys

sale 3:

https://backpack.tf/profiles/76561198123146104#!/compare/1567641600/1567728000

https://backpack.tf/profiles/76561198306211537#!/compare/1567641600/1567728000

Sold for ~14 keys(?)

Sale 4:

https://backpack.tf/profiles/76561198306211537#!/compare/1567641600/1567728000

https://backpack.tf/profiles/76561198128953533#!/compare/1567555200/1567728000

Sold for 16 keys

Sale 5:

https://backpack.tf/profiles/76561198128953533#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561198176647927#!/compare/1567814400/1567900800

Sold for 10 keys?

sale 6:

https://backpack.tf/profiles/76561198176647927#!/compare/1568851200/1569024000

https://backpack.tf/profiles/76561198450467526#!/compare/1569024000/1569110400

Sold for Blizzardy Cannonball + 2 keys

Cannonball Mini:

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

Suggestion for 17.5 keys

Total is 19.5 keys

sale 7:

https://backpack.tf/profiles/76561198450467526#!/compare/1569456000/1569715200

https://backpack.tf/profiles/76561198080179568#!/compare/1569542400/1569628800

Untrace / keys?

Sale 8:

https://marketplace.tf/items/tf2/611;5;u35

$57.99 / $1.84 = 31.52 keys

$43.2 / $1.83 = 23.61 keys

Total sales @:

10, 14, 16, 19.5, 23.61, 24, 31.52 keys

buyers up to 15 keys,

aging seller for 24 keys,

calling 31.52 high,

keeping 16 due to lower sales,

taking 16 - 24 keys