find / -xdev -type f -size +1G -printf "%S\t%p\n" 2>/dev/null | gawk '{if ($1 < 1.0) print $2}' | xargs ls -lsh+  

The command above will quickly catch all sparse files “bigger” J than one Gigabyte, but WILL NOT cross all filesystems ( all network and mounted filesystems will be excluded from the search e.g /oracle /usr/sap etc…) If you want to change the size, please replace the “+1G” with the desired size. For example +10G will  return all files bigger than 10 Gigabytes  

• A very fast find, using xdev – finds only two files – lastlog and faillog :

man find -printf

    -> %p     File's name.
    -> %S     File's  sparseness.   This  is  calculated as (BLOCKSIZE*st_blocks / st_size).  The exact value you will get for an ordinary file of a certain length is system-dependent.  However, normally sparse files will have values less than 1.0, and files which use indirect blocks may have a value which is  greater than  1.0.   The value used for BLOCKSIZE is system-dependent, but is usually 512 bytes.   If the file size is zero, the value printed is undefined.  On systems which lack support for st_blocks, a file's sparseness is assumed to be 1.0.

• We execute ls –lsh and see the difference (DP is processing the file size in red   ):

• I create a 2GB sparse file with actual size 0 bytes under /var/tmp/ , named kalintest.sparse :

• Running the find command again finds it, alongside with the other files :

• I create another file under /var/tmp the same way, this time named kalnitest.sparse2 : 

• The file is found again, using the same command :

• I delete both files, running the find again returns the desired results :