How can I tell if anyone has stolen pics off of my website?

I know if you see a pic that may be stolen on someones website or page, you can check it on tineye to see if it was indeed stolen and from who, but what if you haven't actually seen the pic on someone's page. I own a bakery and was informed that someone may have stolen my pics of cakes, but the person who informed me lost the page they saw them on. I was just hoping there was a website or some kind of software that will let me check if any of my pics have been stolen without actually seeing the stolen pic on anyone's website. I hope I explained that well. TIA!