That image is available in hundreds of sites and in thousands of instances if you count the amazing availability of very large sizes that it's offered in. Check out this Google Image search I did using your example's URL as the point of departure:
http://tinyurl.com/7rxf6vxIf you hover the mouse over each of the images, you'll see the tooltip with the URL. Many of them are in foreign countries, but hardly all of them. This image has spread over the internet like some kind of epidemic in a horror movie.
What's more stunning is that this is true of many of VKT's images, particularly the older ones, that HAN is now harassing people for. For example:
http://tinyurl.com/6obbs7vOkay, that's weird, isn't it? That one is also a VKT image. How about this one?
http://tinyurl.com/75vvmxmI have never seen anything like it. VKT could set a world record for having his IP infringed upon.
With regard to that registration question, please use the Google search bar at the top of the forum page and look for instances of "copyright registration". There are several good posts discussing the issue of bulk registrations. If what you're asking is how you're supposed to know that image is actually part of the collection that was registed in bulk, my answer is I don't know and please tell me if you find out. It seems ridiculous that they expect a person to verify ownership when they bury the information in a totally cryptic manner.
Don't stress out. I know it's hard right now. A lot of the people that contribute to this forum know exactly what you feel like because they went through the same experience.
The more you read, the better you'll feel. It's not likely they'll come after you for a grand. They're asking others for 5-20 times that much. They're just trying to scare you into sending them a check.
Read through the forum posts carefully and don't forget the sticky posts at the top. You will feel more confidence as you know more about what's going on, and you will be able to make rational choices and avoid unforced errors.
If you feel you need faster results, call Matthew Chan (see home page) and pay his very reasonable fee for a consultation. You also have the option of joining Oscar Michelen's letter program (also on the home page). Scroll down to the bottom of the left column to see the links for the updated help options.
Good luck, hang in there and check here often for new developments. There's a lot here about HAN/VKT that will be of interest to you.