Might have sales one day outdated since I've been working on the suggestions for two days!

https://marketplace.tf/items/tf2/31034;5;u9

Marketplace.tf Sales

$50 / $1.93 = 25.91 keys

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198340829257#!/compare/1594684800/1595376000

Buyer: https://backpack.tf/profiles/76561198304647574#!/compare/1592956800/1596153600

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561199046258800#!/compare/1589068800/1589155200

Buyer: https://backpack.tf/profiles/76561198396582847#!/compare/1588809600/1589068800

Sale #3

Sold for 24 keys pure-

Seller: https://backpack.tf/profiles/76561198796395930#!/compare/1589414400/1589500800

Buyer: https://backpack.tf/profiles/76561198308791549#!/compare/1589500800/1589846400

Sale #4

Sold for a Purple Energy Yule Hog (35.5 keys)-

Seller: https://backpack.tf/profiles/76561198142972676#!/compare/1593820800/1594080000

Buyer: https://backpack.tf/profiles/76561198445255559#!/compare/1593734400/1593820800

Sale #5

Sold for a Circling Heart Brotherhood of Arms (63 keys)+ 1 key = 64 keys-

Seller: https://backpack.tf/profiles/76561198445255559#!/compare/1593734400/1593820800

Buyer: https://backpack.tf/profiles/76561198244962432#!/compare/1593820800/1593907200

Sale #6

Sold for 23 keys pure-

Seller: https://backpack.tf/profiles/76561198244962432#!/compare/1593907200/1593993600

Buyer: https://backpack.tf/profiles/76561198162118669#!/compare/1593907200/1593993600

Sale #7

Sold for 23 keys pure + 5 refined + sweets-

Seller: https://backpack.tf/profiles/76561198162118669#!/compare/1593993600/1594080000

Buyer: https://backpack.tf/profiles/76561198093136976#!/compare/1593907200/1594080000

Sale #8

Sold with 13 keys for a Menacing Miasma Cranial Carcharodon (38 keys) = 25 keys-

Seller: https://backpack.tf/profiles/76561198093136976#!/compare/1594166400/1594252800

Buyer: https://backpack.tf/profiles/76561198063019051#!/compare/1593993600/1594252800

Sale #9

Untraceable-

Seller: https://backpack.tf/profiles/76561198063019051#!/compare/1594252800/1594339200

Buyer: https://backpack.tf/profiles/76561198177872379#!/compare/1594252800/1594339200

Sale #10

Quicksold-

Seller: https://backpack.tf/profiles/76561198142545849#!/compare/1594252800/1596844800

Buyer: https://backpack.tf/profiles/76561198337734785#!/compare/1594166400/1594252800

Sale #11

Quicksold for a Disco Beat Down Mighty Mitre-

Seller: https://backpack.tf/profiles/76561198337734785#!/compare/1594598400/1594684800

Buyer: https://backpack.tf/profiles/76561198970722371#!/compare/1594598400/1594684800

Sale #12

Untraceable-

Seller: https://backpack.tf/profiles/76561198970722371#!/compare/1594684800/1595635200

Buyer: https://backpack.tf/profiles/76561198095080813#!/compare/1595203200/1596240000

Sale #13

Untraceable-

Seller: https://backpack.tf/profiles/76561198095080813#!/compare/1596240000/1596672000

Buyer: https://backpack.tf/profiles/76561198186201090#!/compare/1596240000/1596412800

Sale #14

Quicksold-

Seller: https://backpack.tf/profiles/76561198186201090#!/compare/1596412800/1596499200

Buyer: https://backpack.tf/profiles/76561199059756914#!/compare/1596240000/1596585600

Sale #15

Sold for a Kill-a-Watt Tough Stuff Muffs (22.5 keys) [using the current suggestion, thanks to Scourge and myself for making the suggestion before!]-

Seller: https://backpack.tf/profiles/76561199059756914#!/compare/1596585600/1596672000

Buyer: https://backpack.tf/profiles/76561198418740133#!/compare/1596672000/1596758400

Sale #16

Sold with a key for a Bubbling Le Party Phantom (25.5 keys) [using the current suggestion for the Party Phantom, thanks for WesBoy for making it!] = 25 keys-

Seller: https://backpack.tf/profiles/76561198396582847#!/compare/1589068800/1589241600

Buyer: https://backpack.tf/profiles/76561198796395930#!/compare/1589155200/1589241600

Sales @ 23, 23, 24, 25, 25 26, 36, 64

Taking 23-26