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I have a similar situation! I have at least one chicken laying really dark eggs (matching color of welsummer eggs I just bought from a breeder). I have no idea which chicken is laying these though. I'll have to play closer attention! I have the following chickens of laying age:
6 black australorps (one of my australorps I know lays darker than the orpingtons, since she always lays in the same spot, but hers isn't the darkest one I'm talking about),
10 buff orpingtons (highly doubt it could be any of the orpingtons since most of them lay a light egg),
and 4 brownish hens that I don't know the breed of. I got them at the feed store so I assume they're either production reds, RIR, or NHreds. Hmmmm, it's a mystery! If I find her maybe I could breed her to one of the welsummer roosters I'm raising. They are only about 6 weeks old currently though.