Sale 1:

https://backpack.tf/profiles/76561198021055079#!/compare/1565049600/1565136000

https://backpack.tf/profiles/76561198140158890#!/compare/1564876800/1565049600

Sold for Collector's Hospitality(~10)

https://bot.tf/stats/listings/4OV93ERQ

B/O of ~7.5 keys, capping

Sale 2:

https://backpack.tf/profiles/76561198218063977#!/compare/1564704000/1564876800

https://backpack.tf/profiles/76561198319679706#!/compare/1561075200/1568592000

untrace

sale 3:

https://backpack.tf/profiles/76561198398536247#!/compare/1565395200/1568937600

https://backpack.tf/profiles/76561198292957777#!/compare/1567209600/1569456000

SCM

Sale 4:

https://backpack.tf/profiles/76561198292957777#!/compare/1569628800/1570492800

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

QS

sale 5:

https://backpack.tf/profiles/76561198441381078#!/compare/1564099200/1564185600

https://backpack.tf/profiles/76561198814515169#!/compare/1564099200/1564185600

Bulk

Sale 6:

https://backpack.tf/profiles/76561198059564845#!/compare/1553385600/1567987200

https://backpack.tf/profiles/76561198394877897#!/compare/1567900800/1567987200

Sold with 5 keys for Blizzardy Glove

Glove Mini:

https://backpack.tf/suggestion/5db13a39d381727c4e48e370

Suggestion for 13 keys

Total is 8 keys

https://bot.tf/stats/listings/4OVKQ53G

B/O of ~7.5 keys, capping

Sale 7:

https://backpack.tf/profiles/76561198117979335#!/compare/1565654400/1565913600

https://backpack.tf/profiles/76561198099925944#!/compare/1565827200/1565913600

Unrtrace

sale 8:

https://backpack.tf/profiles/76561198099925944#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198323565601#!/compare/1566345600/1566432000

QS

sale 9:

https://backpack.tf/profiles/76561198848245209#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198808579976#!/compare/1567209600/1567296000

untrace

sale 10:

https://backpack.tf/profiles/76561198808579976#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198323565601#!/compare/1567209600/1567296000

QS

Sale 11:

https://backpack.tf/profiles/76561198831596900#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198865354802#!/compare/1569888000/1570233600

Bulk

sale 12:

https://backpack.tf/profiles/76561198865354802#!/compare/1570233600/1570320000

https://backpack.tf/profiles/76561198115333881#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198372681544#!/compare/1570233600/1570320000

Untrace

sale 13:

https://backpack.tf/profiles/76561198047940563#!/compare/1570320000/1570492800

https://backpack.tf/profiles/76561198068248732#!/compare/1570406400/1570492800

SCM

Sale 14:

https://backpack.tf/profiles/76561198068248732#!/compare/1570492800/1570579200

https://backpack.tf/profiles/76561198214513491#!/compare/1570147200/1570924800

SCM

Sale 15:

https://backpack.tf/profiles/76561198142264197#!/compare/1564099200/1564185600

https://backpack.tf/profiles/76561198089253101#!/compare/1564099200/1564185600

Sold for 7 keys (QS?)

Sale 16, 17:

https://marketplace.tf/items/tf2/613;5;u35

$13.78 / $1.82 = 7.57 keys <--- https://backpack.tf/item/1370429884

$13.78 / $1.82 = 7.57 keys <--- https://backpack.tf/item/732622434

Total sales @:

7, 7.5, 7.5, 7.5, 7.5 keys

sellers down to 7 keys unsold for nearly a month,

unsold for a week + at ~6.5 keys,

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

given volume of sales at 7.5,

taking 6.5 - 7.5 keys.