does my laptop or PC or any computer that these were opened on have any imprint of them? They were never saved on any other machines HD.
AFAIK, not unless you explicitly set them up to mirror or sync content. I think you're out of luck.
If you can spring the cash to do so, consider keeping important data in at least 3 places (one preferably off-site) across multiple media (HDD, optical,e tc.) to ensure it's safe from loss, HDD crash, optical media corruption, etc.