https://backpack.tf/item/2691969415

5 keys:

https://backpack.tf/profiles/76561199059698603#!/compare/1701561600/1701648000

https://backpack.tf/profiles/76561198400937950#!/compare/1701475200/1701648000

https://backpack.tf/item/9555416753

1:1 for a Frosted Star Taunt: Results Are In:

https://backpack.tf/profiles/76561198311498888#!/compare/1699488000/1699574400

https://backpack.tf/profiles/76561198163506579#!/compare/1699488000/1699574400

More was likely involved since STN pays ~4 keys for the Frosted Star one https://stntrading.eu/item/tf2/Unusual+Frosted+Star+Taunt%3A+Results+Are+In

Buyout for the Twinkling Lights one is ~5 keys https://stntrading.eu/item/tf2/Unusual+Twinkling+Lights+Taunt%3A+Results+Are+In

Things could have changed during the time but there's no way to check it

Dump to STN 5 days later, 3.77 ref matches:

https://backpack.tf/profiles/76561198163506579#!/compare/1700006400/1700092800

https://backpack.tf/profiles/76561199026390261#!/compare/1700006400/1700092800

10 keys match in buyer's compare:

https://backpack.tf/profiles/76561198010962615#!/compare/1701993600/1702080000

https://backpack.tf/stats/Unusual/Taunt%3A%20Results%20Are%20In/Tradable/Craftable/3055

https://stntrading.eu/item/tf2/Unusual+Twinkling+Lights+Taunt%3A+Results+Are+In buyout was ~5 keys, which is around what the other sale is at. The other 5 keys were most likely for the Festivized Formation Taunt: The Mannbulance!