Thanks to K1ng for the info!

Sale 1:

https://backpack.tf/profiles/76561198263308196#!/compare/1519776000/1519862400

https://backpack.tf/profiles/76561198050518375#!/compare/1519776000/1519862400

Sold for 34 pure keys.

Sale 2:

https://backpack.tf/profiles/76561198050518375#!/compare/1519862400/1519948800

https://backpack.tf/profiles/76561198122514109#!/compare/1519948800/1520035200

2 possible sales here:

either it sold for 33 pure, or it sold for 3 keys + Insomnia Cannonball.

Cannonball Mini:

https://backpack.tf/profiles/76561198147805874#!/compare/1515196800/1515283200

https://backpack.tf/profiles/76561198179707937#!/compare/1515196800/1515283200

Sold for Bubbling Peak(31)

https://backpack.tf/profiles/76561198232041512#!/compare/1520726400/1520812800

Sold for GE Capo Capper(32.5)

This sale is traceable as it is the only sale to happen between Beaser & TF2Mart bots.

Averaging price of Cannonball at 32.

total for Cannonball sale is 32 + 3 = 35

Concerning the 2nd sale:

While there is no clear indicator as to which price it sold for, the total from the 1st sale is of a difference of one key both ways.

Even if this cannot be used as a sale, it is certainly support that the hat does not sell for a lot more or a lot less.

Averaging both possible sales still equals 34.

Pricing at 34 keys flat.

K1ng's Comment:

Sale 2 was for 33 keys (IDs match), and unless I missed something I counted 30 keys (checked all histories, but you are free to double check) in sale 1. Buying for 30 and reselling for 33 makes more sense than buying for 34 and reselling for 33 anyways.

Since there's no evidence countering any of the sales, I guess 30-33 will work here.