Item 1, Item 2:

https://backpack.tf/item/11283453275

https://backpack.tf/item/11169429580

Sale 1, 2, 3:

https://marketplace.tf/items/tf2/31241;5;u58

Sold for $49.99 on the 4th of Jan

Keys were $1.85 on the 4th

49.99/1.85

= 27.02

Rounding down to 27

Item 3:

https://backpack.tf/item/12943222055

Sale 4:

https://backpack.tf/profiles/76561198193881166#!/compare/1766966400/1767139200

https://backpack.tf/profiles/76561198453530349#!/compare/1766966400/1767052800

Sold for 27 keys pure (only 18 keys match however B/O is at 26.99)

https://next.backpack.tf/classifieds/snapshots/Cloud%209%20El%20Fiestibrero/69529d2e8c020b4ac9092dc3

https://imgur.com/a/BR8NcET

//

Sellers:

BPTF - None

MPTF - https://marketplace.tf/items/tf2/31241;5;u58 - None

STN - https://stntrading.eu/item/tf2/Unusual+Cloud+9+El+Fiestibrero - None

SCM - https://steamcommunity.com/market/listings/440/Unusual%20El%20Fiestibrero?filter=Cloud+9 - None

Sale(s):

27, 27, 27, 27 (unconfirmed)

Due to 3 other sales at 27 and the B/O showing 27 but only 18 keys appearing. I am taking the 27 rather than the 18. Additionally 18 does seem like a bit of an outlier anyway.

Going with 27 keys flat