If the odor is that bad you have a leak somewhere. You've checked the boiler, the stack pipe is sealed, that leaves the chimney. Get that checked, especially if it's an older chimney. Chimneys are required to have liners now, your's may not. If something settles or cracks the crack can allow flue gases into the house. Hold onto your wallet if that's the case.
The only thing puzzling me is that if the flue gasses are getting into your home, it should be setting off the CO monitor as there is CO present in those gasses.
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