Resuggesting! Thanks to Xerg for letting me know of my mistake.

https://marketplace.tf/items/tf2/31090;5;u144

Marketplace.tf Sales

$55.56 / $1.88 = 29.55 keys (https://backpack.tf/item/8361614395)

$54 / $1.92 = 28.13 keys (https://backpack.tf/item/8347214686)

$54 / $1.99 = 27.14 keys

$54 / $1.86 = 29.03 keys (https://backpack.tf/item/8332544860)

Sale #1

Sold with 6 keys + 3.5ish keys in sweets for a Purple Energy Herald's Helm (33.5 keys) = 34-10= 24 keys-

Seller: https://backpack.tf/profiles/76561198066369838#!/compare/1590192000/1590278400

Buyer: https://backpack.tf/profiles/76561198059098316#!/compare/1590105600/1590278400

Sale #2

Bulk-

Seller: https://backpack.tf/profiles/76561198059098316#!/compare/1593561600/1593648000

Buyer: https://backpack.tf/profiles/76561198162120088#!/compare/1593561600/1593648000

Sale #3

Untraceable-

Seller: https://backpack.tf/profiles/76561198054002248#!/compare/1588809600/1589068800

Buyer: https://backpack.tf/profiles/76561198363395191#!/compare/1588982400/1589068800

Sales @ 24, 27, 28, 29, 30

Taking 24-30