Unfortunately you are extremely unlikely to find them. The photo appears to come from Helena's Fetish Memoirs site where they are shown for a limited number of weeks, then they disappear forever.
I've believe I have them but having been a professional photographer I do respect copyright where I can so will keep them to myself, apart from that I have paid for them!
Although that is fine as a point of principle, I wouldn't see any problem with sharing photos with someone if they've made an effort to find the original photographer but not been able to track them down. By all means do your best to find the original host, but if what BlueTiger says is correct, there might not be any other option!