https://steamcommunity.com/market/listings/440/Unusual%20Clue%20Hairdo

https://backpack.tf/item/14771280466

https://imgur.com/a/jF7gl2A

https://imgur.com/a/NslpRSW

Taking key averages from on the 17th of December: https://steamcommunity.com/market/listings/440/Mann%20Co.%20Supply%20Crate%20Key

2.18, 2.18, 2.17, 2.19, 2.18, 2.18, 2.18, 2.18, 2.17, 2.18, 2.17, 2.17, 2.16, 2.17, 2.17, 2.17, 2.16, 2.16, 2.17, 2.16, 2.15, 2.14, 2.13, 2.13 making the average 2.1666 recurring. Rounding key average on the SCM to 2.17 for the date of purchase.

Item was bought for $196.02, only sale I could find.

196.02/2.17 = 90.3317. Rounding to the nearest whole key is 90 keys.