By trash I mean trash that people throw out and litter everywhere. If you've seen two then I'm sure it was put on them legally. I doubt there's a website, you should get in contact with a local game and parks if you want to know more. Otherwise there's not much you can do. It could be a breeding...
I hope that's a band and not trash. They're probably watching it to see how far It travels. You could contact your local game and parks, they may be looking for it.