Over the past month or so all of our eggs, brown and white, have come with dents/breaks in the pointed end. This should be the strongest part of the shell, what's up?
we had a similar problem a couple of weeks ago. the eggs were wrinkled and thin all over. your eggs are dented and broken at the tips, which may be different then what we experienced. we found out that the wrinkling is caused when a chicken doesnt get enough calcium. we solved it by crushing the eggs shells and baking them till they turn golden brown and then feeding them to the chickens. the main point is to not let the chickens know they are eating their egg shells. maybe you chickens are dropping their eggs when they lay them, and lack of calcium is not the issue. i hope this helped!! good luck!!!
If it's your hen thats pecking them then put a few golf balls in her nesting box, she will peck those instead of the egg she lays, I have/had a hen that was pecking her small end of the egg and the golf balls worked great for me... No more holes.... If it b/c the egg is weak then yes up the calcuim (cooked egg shells or oyster shells) if its b/c they are hitting the hard surface and breaking then add more to the boxes. Good luck !!!
Do you have some sort of soft nesting material in the box? Like pine shavings or straw/hay, etc. Either the eggs are hitting the bottom of the box too hard, but more than likely you have a pecking chicken. Collect the eggs as often as possible during the day, and put golf balls for them to move around while they are laying. Be sure they have good source of calcum also as someone else suggested. If one is pecking the shells and actually gets one to break and figures out how yummy they are, you may have a real problem on your hands as egg eaters are very hard to break.