Your wedding photographer is in deep doodoo.
You never, ever erase the primary source until other copies have been verified as good.
So....if this SD card has been used and written to multiple times since, the possibility of recovering your long deleted and overwritten images from that same SD card is pretty slim.
For the corrupt ones in his backups....corrupt in what way?
There are some file recovery applications available, as well as paid, expensive ones. It is on him to find these, and pay if necessary.
And after this post...we will see a long string of spammish posts promoting some crap thing to recover your pictures.