Copper colored is typically not good. Fist thing that comes to mind is the thrust bearing. There's definitely more trash in there than what I would like to see, and have seen on my own engines. I wouldn't panic yet though, it may just be from inadequate cleaning like Brent said. I would definitely cut another filter open though, and MUCH sooner than 500 miles. More like after another 20-30 minutes of run time. If you see that much trash again, then I'd say you have an issue. If it's clean then, you may be in the clear.