Thanks to Easy Peazy Squeezy Lemons for the assistance!

"May I make a suggestion? Price increase."

Bought (by yours truly) on the 20th of April, 2022 for 62 keys pure.

https://backpack.tf/profiles/76561198169756327#!/compare/1650326400/1650412800 (The compare link from the seller, though it looks like they dumped the keys almost immediately.)

https://backpack.tf/profiles/76561198196427525#!/compare/1650153600/1650412800 (The 62 keys are much more visible here.)

https://imgur.com/nA9mxZp (Steam trade)

https://marketplace.tf/items/tf2/437;5;u90 1 sold on April 16th for $98, keys at the time were $1.74, so the price comes out to 56 keys.

Taking a range of 56-62.