Sale 1:

https://backpack.tf/profiles/76561198079200985#!/compare/1569628800/1569801600

https://backpack.tf/profiles/76561197964546925#!/compare/1570665600/1570752000

SCM

sale 2:

https://backpack.tf/profiles/76561197964546925#!/compare/1570752000/1570838400

https://backpack.tf/profiles/76561198209312111#!/compare/1572739200/1573171200

SCM

sale 3:

https://backpack.tf/profiles/76561198335965202#!/compare/1567209600/1568160000

https://backpack.tf/profiles/76561197964546925#!/compare/1567987200/1568332800

SCM

sAle 4:

https://backpack.tf/profiles/76561198880720487#!/compare/1568851200/1569110400

https://backpack.tf/profiles/76561198204215085#!/compare/1569024000/1569110400

Bulk

sale 5:

https://backpack.tf/profiles/76561198204215085#!/compare/1569369600/1569456000

https://backpack.tf/profiles/76561198151365471#!/compare/1569369600/1569456000

Sold for ~10 keys in sweets

sale 6:

https://backpack.tf/profiles/76561198151365471#!/compare/1569369600/1569456000

https://backpack.tf/profiles/76561198033378852#!/compare/1569456000/1569542400

Sold with ~3 keys in sweets for TW Hallmark

Low by sellers on Hallmark

Sale 7:

https://backpack.tf/profiles/76561198033378852#!/compare/1569974400/1570060800

https://backpack.tf/profiles/76561198136988237#!/compare/1569974400/1570060800

Bulk / high

Sale 8:

https://backpack.tf/profiles/76561198136988237#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198325595749#!/compare/1570147200/1570233600

Bulky

Sale 9:

https://backpack.tf/profiles/76561198325595749#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198274729080#!/compare/1570147200/1570233600

Sold for 8 keys

Sale 10:

https://backpack.tf/profiles/76561198040220388#!/compare/1571011200/1571270400

https://backpack.tf/profiles/76561198082824979#!/compare/1571184000/1571270400

Untrace

sale 11:

https://backpack.tf/profiles/76561198082824979#!/compare/1573171200/1573257600

https://backpack.tf/profiles/76561198127045035#!/compare/1573171200/1573257600

Sold with 5 keys for KaW Neckwear

Sale 12:

https://backpack.tf/profiles/76561198127045035#!/compare/1573171200/1573257600

https://backpack.tf/profiles/76561198845073445#!/compare/1573171200/1573257600

Sold for 72 PArty + 4 keys

Party Mini:

https://backpack.tf/suggestion/5dd5b4596780723b37574028

Suggestion for 3 keys

Total is 7 keys

Sale 13:

https://marketplace.tf/items/tf2/31049;5;u60

$18.99 / $1.79 = 10.61 keys

https://backpack.tf/item/8019960768

Total sales @:

7, 8, 10, 10.61 keys

buyers up to 7 keys,

seller for ~9 keys,

calling an outleir on either end,

taking 8 - 10 keys,

conserves around unsold.