It's the only one I ever saw, so I doubt it was popular. It does make sense, so I suppose in this one instance, someone MIGHT have done it. I can think of no other reason for a perforated cup container inlet into the butt of a match lock.
It was a long time ago since I saw it and beyond a cursory memory, I have nothing to add. I have almost zero knowledge of match locks over what I've read here and other places.
Flint and steel will certainly do the trick on a match, but not as quickly as an ember in the container in the butt. Plus you don't have to lay your gun down and strike a spark.
I don't even remember if it was a cheek-fired gun or a shoulder-fired gun. I do remember a woman owned it and was asking about it. No one had any good ideas, including me. I thought at the time it was to hold more match, but the depth IIRC wasn't sufficient to do so.