Sale #1:

https://backpack.tf/item/13319506898

https://backpack.tf/profiles/76561198013517496#!/compare/1720656000/1720742400 ~ no matches

https://backpack.tf/profiles/76561198252999692#!/compare/1720656000/1720742400 ~ ?

Sale #2:

https://marketplace.tf/items/tf2/30984;5;u291 ~ $19.99 July 16 / 1.7 = 11.75 keys

Sale #3:

https://backpack.tf/profiles/76561198833326612#!/compare/1725062400/1725148800 ~ no matches

https://backpack.tf/profiles/76561199062312081#!/compare/1724976000/1725321600 ~ Circling Heart Bootleg Base Metal Billycock

Better used on the billycock as there are no other usable sales (will link the suggestion for the billycock for explanation)

Sale #4:

https://backpack.tf/profiles/76561199581722058#!/compare/1718755200/1718841600 ~ no matches

https://backpack.tf/profiles/76561198833326612#!/compare/1718755200/1718841600 ~ 11 keys + 66 ref matches (the PE hat was the other keys as histories match)

= 12 keys

Sale #5:

https://backpack.tf/profiles/76561198085802571#!/compare/1718668800/1718755200

https://backpack.tf/profiles/76561199581722058#!/compare/1718668800/1718755200 ~ dumped with another hat + keys, unable to tell what STN valued them at individually

Sales @ 12, 12