Taking last 2 months (August 22 on)

Sale 1:

https://backpack.tf/profiles/76561198402506689#!/compare/1566950400/1567209600

https://backpack.tf/profiles/76561198304302520#!/compare/1566864000/1566950400

Sold for Strange Blizzardy Puffy

use there

Sale 2:

https://backpack.tf/profiles/76561198086194147#!/compare/1569196800/1571184000

https://backpack.tf/profiles/76561198199381682#!/compare/1557878400/1569456000

SCM

Sale 3:

https://backpack.tf/profiles/76561198002757046#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198423468710#!/compare/1566518400/1566604800

Sold for 11 keys

Sale 4:

https://backpack.tf/profiles/76561198423468710#!/compare/1566777600/1566864000

https://backpack.tf/profiles/76561198173708001#!/compare/1566777600/1566864000

Sold for ~10 keys (keys came from HyperToe, trace by refined on buyers side)

Sale 5:

https://backpack.tf/profiles/76561198286234945#!/compare/1568332800/1568419200

https://backpack.tf/profiles/76561198097271466#!/compare/1568332800/1568419200

sold for ~9.5 keys

sale 6:

https://backpack.tf/profiles/76561198043691003#!/compare/1569196800/1569283200

https://backpack.tf/profiles/76561198337734785#!/compare/1569196800/1569283200

Sold for ~9 keys (QS)

Sale 7:

https://backpack.tf/profiles/76561198337734785#!/compare/1570320000/1570406400

https://backpack.tf/profiles/76561198096673788#!/compare/1570060800/1570406400

https://backpack.tf/profiles/76561198337734785#!/compare/1570320000/1570406400

Buyers remorse

Sale 8:

https://backpack.tf/profiles/76561198337734785#!/compare/1570752000/1570838400

https://backpack.tf/profiles/76561198157621024#!/compare/1568678400/1570838400

Keys

sale 9:

https://backpack.tf/profiles/76561198157621024#!/compare/1570838400/1571011200

https://backpack.tf/profiles/76561197979774655#!/compare/1570838400/1571011200

Sold with ~8 keys in sweets for TW Slo Poke

use there

Sale 10:

https://backpack.tf/profiles/76561197979774655#!/compare/1571443200/1571529600

https://backpack.tf/profiles/76561198365335301#!/compare/1571443200/1571529600

Sold for ~9.5 keys

Sale 11:

https://backpack.tf/profiles/76561198121096537#!/compare/1568592000/1568678400

https://backpack.tf/profiles/76561198063640894#!/compare/1568246400/1568678400

Bulky

Sale 12:

https://backpack.tf/profiles/76561198063640894#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198055969370#!/compare/1569456000/1570233600

Sold for G Fetti Handcraft + ~1 key in sweets

use there

Sale 13 - 15:

https://marketplace.tf/items/tf2/314;5;u62

$27.99 / $1.84 = 15.21 keys

$16 / $1.81 = 8.84 keys <--- https://backpack.tf/item/7957137525

$22 / $1.82 = 12.09 keys

Total sales @:

8.84, 9, 9.5, 9.5, 10, 11, 12.09, 15.21 keys

buyers up to 9 keys,

unsold for ~9.5 keys poorly bumped,

unsold for 10 keys for a month,

gonna take 9.5 - 11 keys, conserving around unsold.