Thanks to Icycrevasse for the assistance!

Item 1

https://backpack.tf/item/12689339410

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198828014528#!/compare/1687824000/1688860800

Buyer: https://backpack.tf/profiles/76561199245733895#!/compare/1688428800/1688515200

Item 2

https://backpack.tf/item/12677754398

Sale #2

Sold for 28 keys + 1 refined-

Seller: https://backpack.tf/profiles/76561198073818313#!/compare/1685491200/1686009600

Buyer: https://backpack.tf/profiles/76561198849024279#!/compare/1685836800/1686009600

Item 3

https://backpack.tf/item/12144300780

Sale #3

Sold for a Purple Energy Undercover Brolly (26 keys) + Runic Imprisonment Taunt: The Hot Wheeler (way too high given current sellers, excluding here)-

Seller: https://backpack.tf/profiles/76561198339104273#!/compare/1685664000/1685750400

Buyer: https://backpack.tf/profiles/76561198393303870#!/compare/1685491200/1686700800

Sale #4

Untraceable-

Seller: https://backpack.tf/profiles/76561198393303870#!/compare/1686700800/1687651200

Buyer: https://backpack.tf/profiles/76561199101508611#!/compare/1686614400/1686700800

Sale #5

Transfer from bot to owner-

Seller: https://backpack.tf/profiles/76561199101508611#!/compare/1686700800/1686787200

Buyer: https://backpack.tf/profiles/76561199041022874#!/compare/1686700800/1686787200

Item 4

https://backpack.tf/item/11810002244

Sale #6

Bulk Sale-

Seller: https://backpack.tf/profiles/76561198063978488#!/compare/1687132800/1687305600

Buyer: https://backpack.tf/profiles/76561198261483133#!/compare/1688774400/1688860800

Item 5

https://backpack.tf/item/10736877983

Sale #7

Sold for a Aces High Infernal Impaler (12.5 keys) + a spelled Towering Pillar of Hats + 5 keys (no usable sales for the spelled item, no tangible value anywehre else so unusable)-

Seller: https://backpack.tf/profiles/76561198106112825#!/compare/1681257600/1681430400

Buyer: https://backpack.tf/profiles/76561199110825177#!/compare/1681257600/1681430400

Sale #8

Untraceable-

Seller: https://backpack.tf/profiles/76561199110825177#!/compare/1681430400/1683763200

Buyer: https://backpack.tf/profiles/76561199085116273#!/compare/1681516800/1681603200

Sale #9

Transferred between bots-

Seller: https://backpack.tf/profiles/76561199085116273#!/compare/1681689600/1681776000

Buyer: https://backpack.tf/profiles/76561199059698603#!/compare/1681776000/1681862400

Sale #10

Untraceable-

Seller: https://backpack.tf/profiles/76561199059698603#!/compare/1682467200/1682553600

Buyer: https://backpack.tf/profiles/76561198369584647#!/compare/1638662400/1684368000

Item 6

https://backpack.tf/item/10421937975

Sale #11

Untraceable-

Seller: https://backpack.tf/profiles/76561199224789549#!/compare/1687651200/1687910400

Buyer: https://backpack.tf/profiles/76561199161916038#!/compare/1687824000/1687910400

Sale #12

Untraceable-

Seller: https://backpack.tf/profiles/76561199161916038#!/compare/1687910400/1687996800

Buyer: https://backpack.tf/profiles/76561198850121720#!/compare/1688256000/1688342400

Item 7

https://backpack.tf/item/9499071406

Sale #13

Untraceable-

Seller: https://backpack.tf/profiles/76561198825409578#!/compare/1685491200/1686441600

Buyer: https://backpack.tf/profiles/76561198121536574#!/compare/1685750400/1685923200

Sale #14

Bulk for something, untraceable-

Seller: https://backpack.tf/profiles/76561198121536574#!/compare/1686009600/1686096000

Buyer: https://backpack.tf/profiles/76561198327062018#!/compare/1686096000/1686441600

Item 8

https://backpack.tf/item/8639260298

Sale #15

Sold for a Winter Spirit Taunt: The Fubar Fanfare? (too low to use here)-

Seller: https://backpack.tf/profiles/76561198114335037#!/compare/1687564800/1687651200

Buyer: https://backpack.tf/profiles/76561198288294254#!/compare/1687478400/1687564800

Sale #16

Untraceable-

Seller: https://backpack.tf/profiles/76561198288294254#!/compare/1687651200/1687737600

Buyer: https://backpack.tf/profiles/76561198078324219#!/compare/1687910400/1687996800

Sale #17

Untraceable-

Seller: https://backpack.tf/profiles/76561198078324219#!/compare/1687996800/1688256000

Buyer: https://backpack.tf/profiles/76561199026390261#!/compare/1688083200/1688169600

Item 9

https://backpack.tf/item/8528670497

Sale #18

Sold for 25 keys-

Seller: https://backpack.tf/profiles/76561198066207210#!/compare/1682208000/1682812800

Buyer: https://backpack.tf/profiles/76561198888158862#!/compare/1682553600/1682640000

Sale #19

Pretty sure it sold for 25 keys-

Seller: https://backpack.tf/profiles/76561198888158862#!/compare/1682899200/1682985600

Buyer: https://backpack.tf/profiles/76561198000946450#!/compare/1637798400/1682985600

Item 10

https://backpack.tf/item/8451949081

Sale #20

Untraceable-

Seller: https://backpack.tf/profiles/76561198453530349#!/compare/1683849600/1683936000

Buyer: https://backpack.tf/profiles/76561198078324219#!/compare/1683936000/1684108800

Sale #21

Untraceable-

Seller: https://backpack.tf/profiles/76561198078324219#!/compare/1684454400/1684540800

Buyer: https://backpack.tf/profiles/76561199189525766#!/compare/1684368000/1684454400

Sale #22

Bulk Transfer-

Seller: https://backpack.tf/profiles/76561199189525766#!/compare/1684886400/1684972800

Buyer: https://backpack.tf/profiles/76561198220130891#!/compare/1685577600/1686355200

Sale #23

Untraceable-

Seller: https://backpack.tf/profiles/76561198220130891#!/compare/1686355200/1686441600

Buyer: https://backpack.tf/profiles/76561198280693486#!/compare/1686355200/1686441600

Sale #24

Sold for 24 keys (buyer's side)-

Seller: https://backpack.tf/profiles/76561198280693486#!/compare/1687996800/1688083200

Buyer: https://backpack.tf/profiles/76561198970722371#!/compare/1688083200/1688428800

Item 11

https://backpack.tf/item/8367324265

Sale #25

Untraceable-

Seller: https://backpack.tf/profiles/76561198829669573#!/compare/1682640000/1682726400

Buyer: https://backpack.tf/profiles/76561198938314806#!/compare/1682726400/1682812800

Sale #26

Seems to have been sold for some keys (10 in total) but nothing else appears, untraceable-

Seller: https://backpack.tf/profiles/76561198938314806#!/compare/1683244800/1683331200

Buyer: https://backpack.tf/profiles/76561199189525766#!/compare/1683244800/1683331200

Sale #27

Untraceable-

Seller: https://backpack.tf/profiles/76561199189525766#!/compare/1683676800/1683763200

Buyer: https://backpack.tf/profiles/76561198257907868#!/compare/1683331200/1683763200

Item 12

https://backpack.tf/item/9056505406

Sale #28

Sold for 31 keys-

Seller: https://backpack.tf/profiles/76561199125443371#!/compare/1686096000/1686182400

Buyer: https://backpack.tf/profiles/76561198985242679#!/compare/1686182400/1686614400

Sale #29

Sold for an Energetic Haunter Twisted Topper (14 keys) + less than a key worth of sweets (too low to be included here)-

Seller: https://backpack.tf/profiles/76561198985242679#!/compare/1686873600/1686960000

Buyer: https://backpack.tf/profiles/76561198412907835#!/compare/1686873600/1686960000

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Mini for the Twisted Topper

Item 1

https://backpack.tf/item/12813869293

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198926117893#!/compare/1682640000/1682726400

Buyer: https://backpack.tf/profiles/76561198402614129#!/compare/1682553600/1682812800

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561198227791420#!/compare/1683072000/1683158400

Buyer: https://backpack.tf/profiles/76561199111073161#!/compare/1683331200/1683417600

Sale #3

Sold for 14 keys-

Seller: https://backpack.tf/profiles/76561199111073161#!/compare/1684022400/1684108800

Buyer: https://backpack.tf/profiles/76561198122445210#!/compare/1684108800/1684454400

Item 2

https://backpack.tf/item/11417838147

Sale #4

Untraceable-

Seller: https://backpack.tf/profiles/76561198262282791#!/compare/1686873600/1686960000

Buyer: https://backpack.tf/profiles/76561198412907835#!/compare/1686873600/1686960000

Sale #5

Sold with less than half a key worth of items for a Frozen Icefall Yule Hog-

Seller: https://backpack.tf/profiles/76561198412907835#!/compare/1686873600/1686960000

Buyer: https://backpack.tf/profiles/76561198985242679#!/compare/1686873600/1686960000

Sale #6

Untraceable-

Seller: https://backpack.tf/profiles/76561198985242679#!/compare/1687392000/1688947200

Buyer: https://backpack.tf/profiles/76561198847681350#!/compare/1687737600/1687824000

------------------------------------------------------------------------------------

Sale #30

Sold for a Miami Nights Your Worst Nightmare (using this sale to price the Nightmare)-

Seller: https://backpack.tf/profiles/76561198412907835#!/compare/1686960000/1687046400

Buyer: https://backpack.tf/profiles/76561198252081876#!/compare/1686960000/1687046400

Marketplace.tf Sales

https://marketplace.tf/items/tf2/31087;5;u135

MP.TF Sale #1

Sold for $73.99 on April 19, 2023

Keys @ $2.1 = 35.23ish keys

MP.TF Sale #2

Sold for $73.99 on April 24, 2023

Keys @ $2.08 = 35.57ish keys

MP.TF Sale #3

Sold for $73.99 on April 25, 2023

Keys @ $2.05 = 36.09ish keys

MP.TF Sale #4

Sold for $69.99 on May 18, 2023

Keys @ $2.02 = 34.65ish keys

MP.TF Sale #5

Sold for $64.99 on May 24, 2023

Keys @ $2 = 32.50ish keys

Sales @ 24, 25, 25, 25, 28, 33, 35, 35, 36

Taking 24-28 here