I've had a hen lay 2 eggs a day for several days in a row, but that's because I was feeding her beef mince mixed with oats and milk as a treat in the afternoons. I suspect hormones in the beef might have been responsible. Whatever the case, I figured it wasn't good for her and cut back the excess protein.
It may be a prank (29 eggs is getting a bit outlandish), but I'm voting 'wait and see'.