https://backpack.tf/premium/search?item=Spook%20Specs&quality=5&tradable=1&craftable=1&australium=-1&particle=29&killstreak_tier=0

The only item which is not dead is this https://backpack.tf/item/4790936845 (thanks Strange)

Sale #1

Probably sold on marketplace.tf (I mean I am sure, other hats are "dead" but for the sake of a proof)

https://backpack.tf/profiles/76561198084126218#!/compare/1603929600/1604016000

https://backpack.tf/profiles/76561198091502579#!/compare/1604016000/1604102400

Untracable, I am assuming it was sold on marketplace tf https://marketplace.tf/items/tf2/30390;5;u29

Oct 30, 2020

keys https://manic.tf/keyprice/?at=2020-10-30

$50 / $1.84 = 27.17 keys ~~~ 27 keys

Sale #2

Sold on marketplace.tf

Dec 22, 2020

https://manic.tf/keyprice/?at=2020-12-22

$69.99 / $2.04 = 34.31 keys ~~~ 34 keys

My price range is 27-34 keys

My second unusual price suggestion, should be fine