I have had several mice die in walls, under cabinets, in the attic/basement etc. Most found during renovations...mice that had been there a number of years. You don't have to worry about the smell. You don't even know they are there. I tore out the old vent hood over the stove, and found 3 dead mice right on top of it (I guess they fell down the vent pipe). They had been literally right under our noses for quite sometime, and we did not smell a thing.
The moral of the story is, if they die within your walls, don't worry about it.
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