keep a list of how many you've put out and WHERE you hid them

When I was younger and my parents did them with my cousins (some of who were VERY greedy!), they would give everyone a basket to collect the eggs in and then at the end, they would all go in a pile and then be evenly distributed.

You could do one for the younger kids inside and one for the older kids outside. The one inside can be contained to one room.

You could make paper mache eggs to hide...