Bought a very nice spy hat recently.

Proof:

https://imgur.com/gallery/i4846b7

https://backpack.tf/profiles/76561198234831480#!/compare/1533686400/1533772800

https://backpack.tf/profiles/76561198305676157#!/compare/1533686400/1533772800

You can see in those 32 keys obtained together for the unusual.

B/O was 32 keys

Credits to The Glen Coco | S>31 UNUSUALS and Erik (Impersonated) for the help on these other sales.

Proof 2:

Sale on mp.tf https://marketplace.tf/items/180;5;u9

$63.99 / $1.96 = 32.65 keys

=33 Keys

Proof 3:

https://backpack.tf/profiles/76561198317606171#!/compare/1529625600/1529712000

https://backpack.tf/profiles/76561198216906812#!/compare/1528416000/1529712000

https://gyazo.com/5be9b91c5768d90ae521e577fd84ddfb

Untrace bot.tf sale with a B/O of 32 keys.

Going with range of 32-33 based on reccomendations from aforementioned people.