If the Filesystem supports, you could use a perl script to interrogate each file with stat()
On a Linux box I use:
my($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = stat("/path/to/file");
atime (the variable $atime above) is the last access time in seconds since the epoch.
Perhaps use in a 'for' loop to test each file.
Eats shoots and leaves.