Taking last two months, to November 6th, 2020

https://marketplace.tf/items/tf2/31128;5;u163

Nov 7 - $65 / $1.81 = 35.91 keys

Nov 8 - $80 / $1.81 = 44.20 keys

Nov 11 - $49.31 / $1.80 = 27.39 keys

Nov 12 - $49.22 / $1.79 = 27.50 keys

Nov 13 - $88 / $1.79 = 49.16 keys

Nov 13 - $45 / $1.79 = 25.14 keys

Nov 28 - $64 / $1.76 = 36.36 keys

Dec 1 - $65 / $1.76 = 36.93 keys

Dec 1 - $40 / $1.76 = 22.73 keys

Dec 6 - $30 / $1.76 = 17.05 keys

Dec 12 - $60 / $1.89 = 31.75 keys

https://backpack.tf/item/9420042256

https://backpack.tf/item/9416785171

https://backpack.tf/item/9402373546

https://backpack.tf/item/9396812688

https://backpack.tf/item/9300170663

https://backpack.tf/profiles/76561198244361942#!/compare/1602374400/1605830400

https://backpack.tf/profiles/76561197975638235#!/compare/1605744000/1607731200

Untraceable

https://backpack.tf/profiles/76561197987709067#!/compare/1605225600/1605484800

https://backpack.tf/profiles/76561198307602421#!/compare/1605398400/1605484800

Untraceable

https://backpack.tf/profiles/76561198307602421#!/compare/1605657600/1605744000

https://backpack.tf/profiles/76561198797841501#!/compare/1605571200/1605657600

Added 20 keys for Blizzardy Winter Woodsman, better used there

https://backpack.tf/profiles/76561198797841501#!/compare/1605830400/1605916800

https://backpack.tf/profiles/76561198108921886#!/compare/1605830400/1605916800

It doesn't look like the keys leaving the 1st or 2nd BP match, so it looks like 1:1 for Starstorm Insomnia Modest Metal Pile of Scrap

I tried to make a suggestion on the Metal Modest but all the sales were under buyers or over sellers - a mini for it at ~23 keys is in this suggestion:

https://backpack.tf/suggestion/5ff3ba6ad3b9387a47366414

https://backpack.tf/profiles/76561198108921886#!/compare/1605916800/1606003200

https://backpack.tf/profiles/76561199098026893#!/compare/1605830400/1605916800

Untraceable

https://backpack.tf/profiles/76561199098026893#!/compare/1608249600/1608422400

https://backpack.tf/profiles/76561198059036242#!/compare/1608336000/1608422400

Pumpkin Party King Cardbeard

Reindoonicorn Rancher Taunt: Yeti Smash

7 Festivizers

Like 30 refined in hats

https://backpack.tf/profiles/76561197961279983#!/compare/1609027200/1609113600

https://backpack.tf/profiles/76561198113697294#!/compare/1609027200/1609113600

seems to be 26 keys and genuine ham shank

https://backpack.tf/profiles/76561198121830870#!/compare/1605916800/1606003200

https://backpack.tf/profiles/76561198080285001#!/compare/1605657600/1605916800

16 keys

https://backpack.tf/profiles/76561198018177887#!/compare/1605225600/1606003200

https://backpack.tf/profiles/76561198343255531#!/compare/1605225600/1605744000

Untraceable

https://backpack.tf/profiles/76561198343255531#!/compare/1605916800/1606003200

https://backpack.tf/profiles/76561198133955369#!/compare/1598140800/1606003200

27 keys

https://mannco.store/item/28402

https://backpack.tf/item/9350785578

Nothing

https://backpack.tf/profiles/76561198237486466#!/compare/1606953600/1607040000

https://backpack.tf/profiles/76561198849751643#!/compare/1606953600/1607040000

Untraceable

https://backpack.tf/profiles/76561198849751643#!/compare/1607299200/1607385600

https://backpack.tf/profiles/76561198195933333#!/compare/1607385600/1607472000

11 keys + pumpkin party handsome handy thing

https://backpack.tf/profiles/76561198073896407#!/compare/1607558400/1607731200

https://backpack.tf/profiles/76561198018177887#!/compare/1607644800/1607731200

Untraceable

https://backpack.tf/profiles/76561198018177887#!/compare/1608336000/1608422400

https://backpack.tf/profiles/76561198169939863#!/compare/1608163200/1608336000

17 keys

https://backpack.tf/profiles/76561198028943046#!/compare/1605139200/1605225600

https://backpack.tf/profiles/76561198142235454#!/compare/1605139200/1605225600

21 keys

https://backpack.tf/profiles/76561198142235454#!/compare/1605225600/1605398400

https://backpack.tf/profiles/76561198079764636#!/compare/1605225600/1605398400

24 keys

https://backpack.tf/profiles/76561199039289574#!/compare/1605916800/1606089600

https://backpack.tf/profiles/76561198035576574#!/compare/1606003200/1606089600

Searing Plasma Climbing Commander

Strange Festivized Specialized Killstreak Australium Minigun

another 4 keys of sweets

https://backpack.tf/item/7777521795 Veno Shock Taunt: The Dueling Banjo was added to the hollowed helm

https://backpack.tf/profiles/76561198050171441#!/compare/1605484800/1605657600

https://backpack.tf/profiles/76561198050859586#!/compare/1605571200/1605657600

28 keys

https://backpack.tf/profiles/76561198050859586#!/compare/1606348800/1606521600

https://backpack.tf/profiles/76561197998850076#!/compare/1606435200/1606521600

Added 30 for Strange Pumpkin Party Hollowed Helm, using there

https://backpack.tf/profiles/76561198109141608#!/compare/1605916800/1606003200

https://backpack.tf/profiles/76561198065206206#!/compare/1605830400/1605916800

15 keys

https://backpack.tf/profiles/76561198123146104#!/compare/1605657600/1605744000

https://backpack.tf/profiles/76561198309178418#!/compare/1605657600/1605744000

Bulk

https://backpack.tf/profiles/76561198309178418#!/compare/1605830400/1606003200

https://backpack.tf/profiles/76561198035238140#!/compare/1605916800/1606521600

Untraceable

https://backpack.tf/profiles/76561198045278633#!/compare/1608681600/1608768000

https://backpack.tf/profiles/76561199098026893#!/compare/1608595200/1608854400

Untraceable

https://backpack.tf/profiles/76561198302529690#!/compare/1608681600/1608768000

https://backpack.tf/profiles/76561198061489334#!/compare/1608681600/1608768000

Bulk

Sales:

15 - pure

16 - pure

17

17 - pure

21 - pure

23 - items

23

24 - pure

25

26

27

27 - pure

28 - pure

28

32

36

36

37

44

49

everything else is mostly marketplace i think

Classifieds:

https://gyazo.com/d427f4ad90471039e7026a78b083fc12

Buyers from 14-15

Sellers from 26+

26 sellers are 1 day old, 11 days old, 13 days old, 19 days old

sales higher than 26 are half of the data points

hmm

15-17 look like buy orders or low, and most of those were flipped afterwards

maybe sellers at 26 are just sad mishappenings

28-49 is already half of my data points excluded by lower sellers

but two of the 27-28 sales are pure

so i go 21-28