I used to sale Mary Kay about 6 years ago and we were using the pink boxes. I think they went to the black boxes about 4-5 years ago. But I still have lip liners that old and they are still good products.
I got some brow liners from her, and they worked fine. most make up doesn't parish as fast as most other items do, especially if it's taken care of. so to me, it worked like new. :)