Looks like the person who paid 25 gifted it to Convex who then sold this for 15 Keys

https://backpack.tf/profiles/76561199000109119#!/compare/1669075200/1669248000

https://backpack.tf/profiles/76561199229379783#!/compare/1670198400/1671408000 - Better for the Throttlehead

https://backpack.tf/profiles/76561199194784154#!/compare/1671753600/1671840000 - Aces High Human Cannonball + ~17 Keys of Items

https://backpack.tf/profiles/76561198048500446#!/compare/1672099200/1672358400 - ?

https://backpack.tf/profiles/76561198048500446#!/compare/1672704000/1672790400 - 29 Keys

https://backpack.tf/profiles/76561199376209312#!/compare/1672963200/1673308800 - Better for the Ol' Reliable

https://backpack.tf/profiles/76561198850407517#!/compare/1673049600/1673481600 - ?

https://backpack.tf/profiles/76561198083857846#!/compare/1668902400/1669075200 - 17 Keys

https://backpack.tf/profiles/76561198308371114#!/compare/1670544000/1670630400 - 17 Keys + 20 Refined (rounds to 17 Keys)

https://backpack.tf/profiles/76561198117938302#!/compare/1671062400/1672272000 - ?

https://gladiator.tf/time-machine?item=Vivid+Plasma+Twisted+Topper&at=2022-12-21T10%3A44%3A00.000Z - It was listed at 20 Keys for ~1.5 weeks

https://gladiator.tf/time-machine?item=Vivid+Plasma+Twisted+Topper&at=2022-12-22T02%3A38%3A00.000Z - And then 19 briefly

https://backpack.tf/profiles/76561198840697043#!/compare/1626134400/1673568000 - ?

https://backpack.tf/profiles/76561198840697043#!/compare/1673568000/1673654400 - ?

The person who got the Throttlehead sold it soon after for a Festivized Pro KS Aussie Black Box + ~2 Keys of Taunts (Skullcracker + Rancho)

https://backpack.tf/profiles/76561198276738225#!/compare/1670371200/1670544000

This will total about 29 Keys

I wouldn't include 15 because of the steep drop in price from the pre-gift purchase + all of the sales being above it. I also wouldn't include the Cannonball sale, since that's well above the others. 19 - 29 would work as a range here.