Sale 1-3:

https://marketplace.tf/items/tf2/135;5;u30

$26.67 / $1.72 = 15.51 keys

$18.22 / $1.72 = 10.59 keys - under MP buyers : https://imgur.com/a/Bxny3Bc

$31.99 / $1.69 = 18.93 keys // https://backpack.tf/item/5828832841

Sale 4:

untrace - possibly 2nd mp sale

https://backpack.tf/profiles/76561198268554470#!/compare/1581292800/1585094400

https://backpack.tf/profiles/76561198043936328#!/compare/1583971200/1584057600

Sale 5:

untrace

https://backpack.tf/profiles/76561198062756330#!/compare/1585872000/1585958400

https://backpack.tf/profiles/76561198056974324#!/compare/1585958400/1586044800

Sale 6:

bulk

https://backpack.tf/profiles/76561198056974324#!/compare/1585958400/1586044800

https://backpack.tf/profiles/76561198031743044#!/compare/1585958400/1586044800

Sale 7:

11 keys + ~2 keys sweets

https://backpack.tf/profiles/76561198257418429#!/compare/1582761600/1583107200

https://backpack.tf/profiles/76561198053869607#!/compare/1583020800/1583107200

Sale 8:

8 keys + 3 ref - very low, probs something missing

https://backpack.tf/profiles/76561198053869607#!/compare/1583020800/1583107200

https://backpack.tf/profiles/76561198295486957#!/compare/1583020800/1583107200

Sale 9:

untrace

https://backpack.tf/profiles/76561198059021831#!/compare/1583366400/1583452800

https://backpack.tf/profiles/76561198264427849#!/compare/1582243200/1586995200

Sale 10:

untrace

https://backpack.tf/profiles/76561198046069996#!/compare/1581206400/1582156800

https://backpack.tf/profiles/76561198006544512#!/compare/1582070400/1582156800

Sale 11:

15 keys

https://backpack.tf/profiles/76561198006544512#!/compare/1582761600/1582848000

https://backpack.tf/profiles/76561198282065071#!/compare/1582761600/1582848000

Sale 12:

10 keys

https://backpack.tf/profiles/76561198282065071#!/compare/1584835200/1584921600

https://backpack.tf/profiles/76561198374206487#!/compare/1584835200/1584921600

Sale 13:

untrace

https://backpack.tf/profiles/76561198374206487#!/compare/1584921600/1585008000

https://backpack.tf/profiles/76561198311400236#!/compare/1584835200/1584921600

Sale 14:

untrace

https://backpack.tf/profiles/76561198311400236#!/compare/1585353600/1585440000

https://backpack.tf/profiles/76561198965016033#!/compare/1585353600/1585440000

Sale 15:

untrace

https://backpack.tf/profiles/76561198965016033#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198309261884#!/compare/1585353600/1585440000

Sale 16:

buyers on this at 20 keys(https://imgur.com/a/2bc91he) means this will be high outlier

HG Chieftain's Challenge

https://backpack.tf/profiles/76561198309261884#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561198374206487#!/compare/1585526400/1585612800

Sale 17:

11 keys + small sweets

https://backpack.tf/profiles/76561198374206487#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561198429767246#!/compare/1585526400/1585612800

Sale 18:

untrace (probs 15 keys)

https://backpack.tf/profiles/76561198429767246#!/compare/1585872000/1585958400

https://backpack.tf/profiles/76561198135665117#!/compare/1585872000/1585958400

Sale 19:

using there

Haunted Ghosts Familiar Fez

https://backpack.tf/profiles/76561198135665117#!/compare/1585958400/1586044800

https://backpack.tf/profiles/76561198080425549#!/compare/1585958400/1586044800

Sale 20:

15 keys

Blizzardy Storm Triboniophorus Tyrannus(10.75) + 4 keys

https://backpack.tf/profiles/76561198079989511#!/compare/1586044800/1586217600

https://backpack.tf/profiles/76561198080425549#!/compare/1586044800/1586131200

Tyrannus: https://backpack.tf/suggestion/5e9a244daa86d463010d1464

==============================================================================

Sales:

10,11,13,15,15,16,19

many buyers at 14: https://imgur.com/a/w3mX343

2 weeks unsold at 16 makes 19k high sale: https://imgur.com/a/TWpvSat