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About that smell that you think you detect...
I would not otherwise disturb eggs during the lockdown period (you would be better off not moving/handling them because this can run the risk of disorienting the chick inside as to its proper position for pipping and zipping successfully) but for the sake of a potentially nonviable bad egg NOT affecting the rest of them negatively - that is worth making an exception, I believe.
In order to insure that your olfactory sense (smell) functions optimally, I suggest you have a small measuring cup of fresh coffee grounds or coffee beans near at hand.
Just like eating an unsalted soda cracker will "clear" your palate, basically returning your sense of taste to "neutral" (as opposed to confusing residual flavors from one food or drink to the next) between samplings, so too will placing your nose directly over the fresh grounds or beans clear your nose between sniffing one egg and the next. You will notice a difference, I believe.
Pick up each one carefully and get it far enough away from the others that you know you are only smelling THAT particular egg. A "bad egg" smell should be readily apparent, and you should certainly trust your own sense of smell.
In this scenario you cannot afford to be wrong, because a bad egg could crack or explode, contaminating the other eggs or hatchlings with toxic bacteria...the gooey mess itself would be the least of your problems.
I encourage you to do this promptly, and let us know how many bad eggs you separated from your "lockdowns"
Lightfoote