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Do you mean will they start to develop under those conditions?
My answer is NO. The microscopic fertilized cell in an egg will not begin to develop unless it is incubated at a certain constant tempature in an incubater or under a broody hen. It will not begin to develop before the end of even a really hot day, or under a succession of hens laying in the same nest box.
Fertilized eggs can stay viable for up to a week or so unrefrigerated, and even for several days in the refrigerator. So if someone wanted to try to hatch them they might have success with the eggs you gather.
Otherwise, if you are diligent to collect your hens' eggs every day and refrigerate them, you & your customers should have no worry about finding developing chicks inside them. Any tiny blood or meat spots can also be found in non-fertile eggs, as a natural part of the egg-making process. Those things are not evidence of rooster involvement or growing chicks.
You should let your customers know that they're getting fertile eggs. Many folks don't care, others think they're even healthier than unfertilized eggs. But some folks have issues about ending anything's life for their consumption, even pre-embryonic chickens, and would be upset if they weren't told.
