https://mannco.store/item/440-neutron-star-unusual-little-buddy

Someone sold 1 on mannco.store for 18k

30$/1.65$=18k

https://backpack.tf/profiles/76561198453530349#!/compare/1635724800/1635811200 - Don't know but this had a buyout of 35 Keys

https://gladiator.tf/listings/6180cc8e10eaa09a49305cea - The 35 Key buyout

https://backpack.tf/profiles/76561198048792033#!/compare/1639699200/1639785600 - Quicksold for 30 Keys + 1.66 Refined

https://backpack.tf/profiles/76561198140953055#!/compare/1640563200/1640649600 - Don't know but this had a buyout of 36 Keys

https://gladiator.tf/listings/61c7916e755832c61c12c059 - The 36 Key buyout

https://backpack.tf/profiles/76561198262572343#!/compare/1643673600/1643760000 - Bulk sale for a Sunbeams Connoisseur's

https://gladiator.tf/listings/61f95d4cb00955d348d42c6f - The Connoisseur's had a buyout of 86 Keys, so that's another lower sale for this

While 30 quicksold, none of the other lower sales are traceable or usable.

A wide range of 30 to 41 would average to 35.5 Keys, which would match the average of the untraceable 35 and 36 Key sales.

30 to 41 would work here.