I wouldn't worry too much about it - from what I have always been told, they will poop when they are ready.
You stated that you don't see any large swelling down near the vent - no visible signs of problems.
My thoughts are that you are feeding it mice and it is utilizing every bit of it for its growth - no waste being produced.
You should probably move him to rats. My new boa who is 682 grams ate a rat that was 57 grams last night - it was a perfectly sized meal for her.
So it may just be that he isn't eating enough.
Maybe someone with more knowledge will chime in.
Good luck.
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