Maybe time to get the Flux Capacitor out..
Would they get that message if the file did not exist?. It does seem to know about a filename from somewhere
Forget that just did a test and it must be reading another file first to workout the restore plist file name to look for.
Update on this.,
It looks like the restore plist file name is an encoding of the Hype project name, so that is where the name '37863A' is coming from