DU does not account for some files in ../SyncServices/Local/DataReferences

Question

There are 9 files in my $HOME/Library/Application Support/SyncServices/Local/DataReferences/022 directory, as listed in ls -l. When I run du * in this directory, it only accounts for 3 of the 9 files. Using diff, it appears as though the files du ignores are duplicates. My first thought was that there are links to other files in this directory, but ls -l@ shows nothing out of the ordinary.
Anyone know what is up with these files? The have similar names like:
CF0057CF7C5E.com.apple.MobileSync
vs
CF0057CF7C5E.data

Answer 1

There are 9 files in my $HOME/Library/Application Support/SyncServices/Local/DataReferences/022 directory, as listed in ls -l. When I run du * in this directory, it only accounts for 3 of the 9 files. Using diff, it appears as though the files du ignores are duplicates. My first thought was that there are links to other files in this directory, but ls -l@ shows nothing out of the ordinary.
Anyone know what is up with these files? The have similar names like:
CF0057CF7C5E.com.apple.MobileSync
vs
CF0057CF7C5E.data
Try
ls -la -i |sort -n
If the identical files have the same number in column 1, then they are NOT 2 files with the same name, but rather 2 directory entries pointing at the same file. These would be hardlinks, not symlinks.