contact book erase by error with ICloud

Hi,

my young son received his macbook pro 10.8.2 yesterday. He used his mother apple id for ICloud and he erases in Contact bok all his mother's contacts. The next morning his mother's Iphone run out of contacts. Can I do now ? The computer links to iphone was not set for backup. I called Apple the tech, he told me than there is no copy of contacts on hard drive's MacBook. But if I turn off the Wifi, I can read my son's new contact book. I want to know if there was a full copy of original contac book on hard drive's Mac Book ? In this case, i could use a recovery data software.

regards,

Jean