Plastic ziplock bags are great for eggtopsy of any egg, stinky or not.
Sometimes you'd be surprised at what you find. If you go to
www.brinsea.com on the left-hand margin they have their incubation handbook for downloading. In it is a most-helpful index of eggtopsy results cause and effects. You'd be surprised at what humidity problems can do to your embryos!
Last hatch I had a bunch of last minute (Day 19/20) quitters. Turns out it was oxygen deprivation due to hatching sea-level eggs at a high altitude (pores are not conducive to thin mountain air). Had I not done an eggtopsy I would've wondered when they quit and not been able to figure it out... BYC provided the other clues as to what all happened. I also found one egg with a malformation (open brain) which had the cause and effect listed in the handbook. Hopefully never have to see that again!