I have never seen that type of ANACS label before. It looks like the coins have some album toning as well.
If you are happy, great, I'm not a fan. To me that toning is a lot past the pleasing stage and into the terminal black. Given several dates, it may be from the label's photo process, so it may get worse (or it could have just been a little bit of contamination that's now stable). I would check them every year or so and if there is any progression, get them out of those slabs.
I like the toning and is why I've bought them. They had a complete set there except for the 1995, so I asked what is the price for them. He said the average is around $30. buck and I pull these 2 dates. Probably one time I had every dates, but sold most of them when the price of silver were up. Now thinking about getting a complete set of them. I would think it is pretty cheap to put something like this together compare to a complete Peace Silver Dollar set in 63 or better.