So my CS3 got thrown in the bin

Yep. The entire box - DVDs, books, serials, everything.

I just formatted my computer today, went to find my CS3 Design Premium box, and after much investigation, found that someone threw it in the bin, thinking it was an empty box.

So… I don’t have an actual installation of it on my PC, although I HAVE activated+registered. I don’t even have my serial number!!! All I have is the receipt from the store I bought it from a few weeks ago.

What can I do? :*(