Mobile Documents indicates it is pointing to something on the iCloud drive that is referenced on the local drive but physically exists on the iCloud drive. There is a "Mobile Documents" folder in the user's Library named "Mobile Documents" which is essentially an alias of the iCLoud Drive. FAF is reporting finding the alias for those files, which apparently exist only on iCloud.
If we knew what it was we were doing, it wouldn't be called research, would it?
