"Or is this already done and dusted, so that we're sure it was Steve?"
Jesus! Another conspiracy theorist! No, Steve gets out of his Decathlon and swaps with a suicidal pilot [who's family will be recompensed by the grateful Steve Fossett] and surely they must look for the tyre tracks of Steve Fossett's escape car hidden nearby, or maybe the witness marks of the alien space craft that has whisked Steve off to the Scientologist's Planet!!!
How much time was spent on Frank Tallman's crash in the Sierras or Neil Williams' in the Pyrenees?
What possible evidence [other than a note] could explain why another highly experienced pilot hits a granite filled cloud from the remains of the accident?