I don't have any of my upc codes

This really goes for all my EA/bioware games. Untill the last 2 days I didn't think I'd ever be an online player, but when I found out I'd need the keep to load saves into DA:I, I decided to sign up and deal with all that fun stuff. Which included registering my games. Sadly I purchesed the games a long time ago, and do not have the packaging anymore. I do have the cases and disc, but no upc code. Is there anyway I can still regester my games?