If the brown ones are one solid colour, with no speckling at all, then they are chocolate.
So if that's true then here are the genotypes of your mice (also assuming that the 'light brown one' is actually a really ugly recessive yellow)
Blac (a/a)
Chocolate (a/a b/b)
Recessive yellow (a/a e/e)
There's a possibility that the light brown one is chocolate + recessive yellow, and maybe that's why it's so muddy looking. That would be (a/a b/b e/e) 3 recessive genes. That might make sense, lol.
Also, they are all (s/s) which is piebald.
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