Like others suggested. Ceramic eggs or golf balls. Easter eggs/plastic eggs are light and will easily be kicked out of nest. If they are are two halves, open and put clean sand, gravel or small stones in one half and glue together, for extra weight. If you have a large coop, keep them in coop till noon. If you free range then keep them in the run till noon, then you can search the run for eggs. But not all eggs are laid in the morning, so you'll still have to search the yard. GC
X2
Is the second photo the egg in a nest box? If so you may want to bed your nests a little deeper as the exposed wood showing can cause cracking/ breaking of eggs