Sale 1:

https://backpack.tf/profiles/76561198145243123#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198133876805#!/compare/1569888000/1592352000

Untrace

sale 2:

https://backpack.tf/profiles/76561198133876805#!/compare/1569888000/1592352000

https://backpack.tf/profiles/76561198974703657#!/compare/1592265600/1592352000

Sold for 7 keys

sale 3:

https://backpack.tf/profiles/76561198974703657#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198376072450#!/compare/1592092800/1592438400

Sold for ~7.5 keys

sale 4:

https://backpack.tf/profiles/76561198376072450#!/compare/1592092800/1592438400

https://backpack.tf/profiles/76561198339438430#!/compare/1592438400/1592524800

Sold with ~1 key in sweets for DP Impaler

use there

sale 5:

https://backpack.tf/profiles/76561198090987063#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561198092449612#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561198020673987#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561198850178158#!/compare/1588809600/1589932800

Untrace / Bulk /QS

sale 6:

https://backpack.tf/profiles/76561198850178158#!/compare/1594339200/1594425600

https://backpack.tf/profiles/76561198176486615#!/compare/1571875200/1594425600

Can trace a sweet

Sale 7:

https://backpack.tf/profiles/76561198058599230#!/compare/1590105600/1590192000

https://backpack.tf/profiles/76561198279494878#!/compare/1589328000/1590192000

Untrace

sale 8:

https://backpack.tf/profiles/76561198279494878#!/compare/1590192000/1590278400

https://backpack.tf/profiles/76561198046636569#!/compare/1589932800/1590278400

Sold with 1 key for P Fetti Toy Soldier(8.5)

Total is ~7.5 keys

sale 9:

https://backpack.tf/profiles/76561198341550006#!/compare/1591833600/1591920000

https://backpack.tf/profiles/76561198155513909#!/compare/1591833600/1591920000

Sold for ~8.5 keys (keys used to buy Pom Pom)

sale 10:

https://backpack.tf/profiles/76561198155513909#!/compare/1591833600/1591920000

https://backpack.tf/profiles/76561198798648250#!/compare/1591833600/1591920000

Sold for keys, can trace ~4.5 keys.

sale 11:

https://backpack.tf/profiles/76561198798648250#!/compare/1591833600/1591920000

https://backpack.tf/profiles/76561198180001574#!/compare/1591833600/1591920000

untrace

sale 12:

https://backpack.tf/profiles/76561198180001574#!/compare/1591920000/1592006400

https://backpack.tf/profiles/76561198886886042#!/compare/1591142400/1591920000

Sold with ~0.49 keys in sweets for KAW Oiled

Oiled Mini:

https://backpack.tf/suggestion/5f264f993cbb5d01ed04b341

Suggestion for 9 keys

Total is ~8.5 keys

sale 13:

https://backpack.tf/profiles/76561198886886042#!/compare/1591920000/1592006400

https://backpack.tf/profiles/76561198873539085#!/compare/1591920000/1592006400

Sold for Bubbling Carouser + ~1.49 keys in sweets

Carouser Mini:

https://backpack.tf/suggestion/5f2664b7cfa6b257407f3c16

suggestion for 6.75 keys

Total is ~8.5 keys

sale 14:

https://backpack.tf/profiles/76561198873539085#!/compare/1592179200/1592524800

https://backpack.tf/profiles/76561199043177646#!/compare/1592438400/1592524800

Bulk

sale 15:

https://backpack.tf/profiles/76561199043177646#!/compare/1592784000/1592870400

https://backpack.tf/profiles/76561198083199151#!/compare/1592438400/1592870400

Can trace some keys

sale 16:

https://backpack.tf/profiles/76561198850274253#!/compare/1589500800/1589587200

https://backpack.tf/profiles/76561198375249913#!/compare/1589500800/1589587200

Untrace

sale 17:

https://backpack.tf/profiles/76561198375249913#!/compare/1589760000/1589846400

https://backpack.tf/profiles/76561198317152077#!/compare/1589760000/1589846400

Sold for 8 keys

sale 18:

https://backpack.tf/profiles/76561198020673987#!/compare/1588377600/1588291200

https://backpack.tf/profiles/76561198850274253#!/compare/1588291200/1588377600

QS / Bulk

sale 19:

https://backpack.tf/profiles/76561198850274253#!/compare/1588896000/1588982400

https://backpack.tf/profiles/76561198144551589#!/compare/1514937600/1590278400

Bulk for keys

sale 20:

https://backpack.tf/profiles/76561198892957312#!/compare/1593388800/1594512000

https://backpack.tf/profiles/76561199043177646#!/compare/1595548800/1595635200

QS

Sale 21:

https://marketplace.tf/items/tf2/30767;5;u35

$26.25 / $2.03 = 12.93 keys

$21.89 / $1.93 = 11.34 keys

$13.49 / $1.94 = 6.95 keys

Total sales @:

7, 7, 7.5, 7.5, 8, 8.5, 8.5, 8.5, 11, 13 keys

buyers up to ~6.69 keys,

2 sellers for ~9 keys, new and aging:

https://i.imgur.com/TqbF9Sz.jpg

considering one 7 sale was resold for 7.5 quickly,

taking 7.5 - 8.5 keys