H.K.
I believe there are a few ways you could find out previous owners. One is if you bought your home from them then their name and info should be on some of the sale docs etc., go back into your records and look for their name and info. (If it was more than one owner ago look at the "title search" which should list previous owners-- confirming you now have good title/ownership)
Once you have their name, even if the address is wrong, you can "google" search and try to find a phone number or email for them.
If you can not come up with a name or other contact info by searching through ownership documents I would suggest going to the county of records and finding out previous owners this way (might be a bit more tedious or have some charge). I believe property owners are public record, even if not, a title search for your home would list all of its owners and the county records clerk should know how to get you the info you seek.
I hope these ideas help! Good luck!
PS- It is really nice of you to try to find the people to give them a picture back! God Bless you!