I lost my code for Sims 2?

OK so my dad bought be the Sims 2 double deluxe and i was so exited! but then i lost the registration code cause i cant find the packet that went inside!! what do i do? i know hes not gonna buy me another one now but if anyone would just be so nice to let me have there registration code if that will work it might sound stupid but my dad bought me these for nothing and they were expensive. or if someone would tell me how i can get a code without paying! PLEASE PLEASE i really need a code!