eggs are filthy, coated with dirt and garbage. what happened?

Provided the nest boxes are clean and dry, my guess as well would be mud or poop on their feet getting tracked into the nest boxes.

Occasionally you'll get birds that are messy layers, that is, they may poop a little while pushing out eggs, but that should only affect the contents of the nest box they use and provided you clean it up regularly, shouldn't affect most of the other eggs.
 

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