I know that I will be waking this tread up but I need help.  I have a 3TB iMac and allocated 500GB to install bootcamp years ago and just recently removed it through bootcamp assistant and have not been able to recover that disk space.  Here is my diskutil list from terminal.  ANy help would be appreciated.
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *3.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            1.7 TB     disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:          Apple_CoreStorage Macintosh HD            801.4 GB   disk0s4
   5:                 Apple_Boot Boot OS X               134.2 MB   disk0s5
/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +2.5 TB     disk1
                                 Logical Volume on disk0s2, disk0s4
                                 5386CAC8-A681-4AA9-B5A4-620F88CE4323
                                 Unencrypted
/dev/disk3 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +8.4 GB     disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:                  Apple_HFS InstallESD              8.0 GB     disk3s2