They were in Big Thunder Ranch last year at Halloween time (free), or they are at Storyteller's for the Critter Breakfast, and I believe we've seen at least one if not both at Goofy's Kitchen.
As a PP said, last year they were out at the Big Thunder Ranch Carnival dressed as "cops". They did not always meet together (sometimes they did, but mostly they were apart). They just wandered around the Carnival area and guests could go up to them for a photo. I did not see them in costume outside of the Carnival during regular operating hours.
thanks for the responses, we missed them on our trip last year and wanted to make sure we see them this time. I think I will try to see them at DCA or during carnival.