Sale 1:

https://backpack.tf/profiles/76561198323565601#!/compare/1581292800/1581379200

https://backpack.tf/profiles/76561198163946664#!/compare/1581379200/1586217600

Sold for 8 keys

Sale 2:

https://backpack.tf/profiles/76561198275551150#!/compare/1582070400/1582329600

https://backpack.tf/profiles/76561198047887998#!/compare/1582243200/1582329600

Sold for DP Bone Dome

use there

sale 3:

https://backpack.tf/profiles/76561198047887998#!/compare/1582243200/1582329600

https://backpack.tf/profiles/76561198980797020#!/compare/1582070400/1582329600

Bulk

sale 4:

https://backpack.tf/profiles/76561198980797020#!/compare/1582329600/1582416000

https://backpack.tf/profiles/76561198208823517#!/compare/1582243200/1582329600

Bulk

sale 5:

https://backpack.tf/profiles/76561198208823517#!/compare/1582761600/1582848000

https://backpack.tf/profiles/76561198337734785#!/compare/1582761600/1582848000

Sold for ~6 keys (QS)

sale 6:

https://backpack.tf/profiles/76561198856832719#!/compare/1582675200/1582761600

https://backpack.tf/profiles/76561198337734785#!/compare/1582588800/1582675200

QS

sale 7:

https://backpack.tf/profiles/76561198064804350#!/compare/1583193600/1583366400

https://backpack.tf/profiles/76561198337734785#!/compare/1583107200/1583193600

Sold for ~7 keys

sale 8:

https://marketplace.tf/items/tf2/30767;5;u60

$20.99 / $1.78 = 11.79 keys <--- https://backpack.tf/item/7118804411

$16 / $1.69 = 9.47 keys

$15 / $1.79 = 8.38 keys

Total sales @:

7, 8, 8.5, 9.5, 12 keys

buyers up to ~6.5 keys,

seller at 10 keys unsold for months,

seller at ~7.5 unsold for a month:

https://bot.tf/stats/listings/4WXX21N0

seller at ~6.5 just listed:

https://backpack.tf/item/5515352411

https://bot.tf/stats/listings/4KVQG7RN

taking 7 - 9.5 keys, watching seller at ~6.5 keys.