Proofs:

Bought for Disco Beat Down Modest Metal Pile of Scrap (45 keys, but its oudated, so will take sellers price - 37 keys) with 1 sweet (Double-spelled Track Terrorizer):

https://backpack.tf/profiles/76561198099136395#!/compare/1532995200/1533081600

Also sold Double-spelled Track Terrorizer for 2 keys:

https://backpack.tf/profiles/76561198099136395#!/compare/1533168000/1533254400

Also I've been trying to sell it for 35 keys.

So, I think there are enough proofs to update the price (after 3 years)