All the libraries I have bought/seen advertised say mastered at 24/96. Is this meaning simply that the audio was cleaned up, metadata was added and its ready for drag and drop use? Or is there something more?
In that context I tend to read "mastered" as audio that is edited, problems eq'd out, strange noises removed, etc. Sometimes that can also imply downsampling from a higher sample rate.
I don't tend to read that as having anything to do with metadata.
I also don't take that to imply any sort of dynamics processing.