Finally I bought something great.

Bought with 978keys pure + S Blizzard veil(duped) + SF Thousand-yard Stare + Frozen Icefall Spiky viking

Minis

veil: https://backpack.tf/stats/Unusual/Villain's%20Veil/Tradable/Craftable/30

250keys

SF Thousand-yard Stare : https://backpack.tf/stats/Unusual/Thousand-Yard%20Stare/Tradable/Craftable/14

Its bp.tf price is 80~85keys, but buy orders were at 91keys when the trade went threw.

FI viking: https://backpack.tf/stats/Unusual/Spiky%20Viking/Tradable/Craftable/135

20keys

978+250+91+20=1339keys, rounding up to 1350keys pure.

seller

https://backpack.tf/profiles/76561198368868701#!/compare/1643068800/1643500800

it only shows 978keys+veil, I think he just QS other 2 unusuals.

https://backpack.tf/profiles/76561198135471163#!/compare/1643414400/1643500800

mine shows a lot other items too, but checking both item history can find out the seller owned it one before he QS.

SF Thousand-Yard Stare history: https://backpack.tf/item/10329222032

Frozen icefall viking history : https://backpack.tf/item/10109147748

extra sreenshot of 978keys+minis.

https://prnt.sc/26mdi03

+prof kit and parts are added after the trade went threw.