When loading individual events/sounds in an FMOD bank file, the cook will emit a warning for each asset which pollutes the log file with superfluous messages. This is because the actual event/sound is loaded in memory only rather than on disk.
Log Warning Example:
LogCook:Warning: Unable to find cached package name for package (path)
Initial thought is that DoesPackageExist is returning true for this scenario when it should probably return false as it does for script packages.
I don't have repro steps
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-41012 in the post.