How could millions of people in Mexico eat these unrefrigerated eggs day after day without some horrendous gastrointestinal disturbance? From what I've read about this issue, once you refrigerate them, keep them that way. If out at room temperature for more than a couple of hours, the eggs will sweat and this allows bacteria to enter the egg through the shell. Look for a date no more than three days from the current date and you should be fine.
By the way, the eggs had a deep golden yolk, tasted fresh, and were delicious.