Here we go

Sale #1 (https://backpack.tf/item/3955279867)

https://marketplace.tf/items/tf2/779;5;u16

Sold for 43.9 USD. Keys at the time were 1.83, 43.9/1.83= ~24 keys

Sale #2 (https://backpack.tf/item/3955279867)

https://backpack.tf/profiles/76561199069541084#!/compare/1599696000/1601078400

https://backpack.tf/profiles/76561198085707371#!/compare/1495670400/1600300800

Bulk

Sale #3 (https://backpack.tf/item/3955279867)

https://backpack.tf/profiles/76561198085707371#!/compare/1600214400/1600300800

https://backpack.tf/profiles/76561198032176942#!/compare/1602720000/1602806400

Untraceable

Sale #4 (https://backpack.tf/item/3955279867)

https://marketplace.tf/items/tf2/779;5;u16

Sold for 41.9 USD on Marketplace. Keys at the time were 1.84, 41.9/1.84= ~23

Sale #5 (https://backpack.tf/item/3955279867)

https://marketplace.tf/items/tf2/779;5;u16

Sold for 21 USD. Keys at the time were 1.84, 21/1.84= ~11.4

https://bot.tf/stats/listings/Y79P30Z8

Buy orders at the time were 13 keys and 39 ref, excluding.

Sale #6 (https://backpack.tf/item/3955279867)

https://imgur.com/a/yMyYf81

Sold for 13 keys.

https://bot.tf/stats/listings/MXEE63Z1

Buy orders were 14 keys 8 ref at the time, excluding.

Sale #7 (https://backpack.tf/item/7881480004)

https://backpack.tf/profiles/76561198125894529#!/compare/1599264000/1599523200

https://backpack.tf/profiles/76561198309552788#!/compare/1599177600/1599523200

Sold for a Brain Drain Murderer's Motif, owner of the vivid plasma hat added a key.

Sale #8 (https://backpack.tf/item/3955279867)

https://imgur.com/a/FWo4paJ

Sold for 13 keys + Strange Whirly Warrior (~1 key) + Lurking Legionnaire (~30 ref) + ToD Ticket (~18 ref). Rounding to 15.

Mini for the Murderer's Motif:

Only including pure sales, as there were A LOT of sales.

#1

https://mannco.store/item/11158

Sold for 31 USD. Keys were 1.7 at the time, sale is ~18 keys

#2

https://mannco.store/item/11158

Sold for 33 USD. Keys were 1.63, rounding the sale to ~20 keys

#3

https://backpack.tf/profiles/76561198287998341#!/compare/1600214400/1600300800

15 keys, excluding because under current buy orders

#4

https://backpack.tf/profiles/76561198327468683#!/compare/1600300800/1600387200

https://backpack.tf/profiles/76561198287998341#!/compare/1600300800/1600387200

15 keys, excluding because under current buy orders

#5

https://backpack.tf/profiles/76561198327468683#!/compare/1600387200/1600560000

https://backpack.tf/profiles/76561198068703263#!/compare/1600473600/1600560000

16 keys

#6

https://backpack.tf/profiles/76561198192912409#!/compare/1598832000/1600214400

https://backpack.tf/profiles/76561198280163760#!/compare/1598227200/1599004800

Possibly given for free/cash, can't really tell what it went for.

#7

https://backpack.tf/profiles/76561198280163760#!/compare/1600128000/1600646400

https://backpack.tf/profiles/76561198135388328#!/compare/1600041600/1600128000

https://bot.tf/stats/listings/Y3WK6WLR

Sold for ~11 keys, buy orders at the time were 12 so excluding.

#8

https://backpack.tf/profiles/76561198264380993#!/compare/1596412800/1596931200

https://backpack.tf/profiles/76561198155806878#!/compare/1587772800/1596672000

Untraceable

#9

https://backpack.tf/profiles/76561199084784906#!/compare/1600128000/1600214400

https://backpack.tf/profiles/76561198391727951#!/compare/1599955200/1600214400

Untraceable

#10

https://gyazo.com/b769c5de9272d218e8f378a9512fada0

https://prnt.sc/v6j8ps

Sold for 15k + sweets, which add ~2.55k. Rounding to 18

#11

https://backpack.tf/profiles/76561198253177889#!/compare/1597795200/1597881600

https://backpack.tf/profiles/76561198124208012#!/compare/1566259200/1566345600

11 keys, excluding because under current buy orders

#12

https://backpack.tf/profiles/76561198393109652#!/compare/1597881600/1597968000

https://backpack.tf/profiles/76561198135388328#!/compare/1597881600/1597968000

Untraceable

#13

https://backpack.tf/profiles/76561198393109652#!/compare/1598054400/1598140800

https://backpack.tf/profiles/76561198872384855#!/compare/1597708800/1598054400

Sold for 14 and some ref, excluding because it is under current buy orders.

Valuing Motif at 18-20. The lid and 1 key leaves the trade at 17-19

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Taking 15-24, feedback is definitely helpful.