Eggs

My son loves eggs. He doesn't love to eat them; he loves to carry them around. He doesn't carry one; he carries the whole carton. He carries it like one would carry a baby. Occasionally he opens up the carton and takes one out and walks around with it and then puts it back in. We often try to hard boil the eggs we give him, but I took him to the grocery store today and he has been carrying a carton of eggs since then. I'm not sure what this means. I don't remember covering this in any child development classes I took. I'm pretty sure I did not learn about this while learning about children acquiring language. So now I need to go back to the store and buy some more eggs because I don't think I will get these back. Right now they are all in baby wipes to keep them clean.
If anyone knows what egg obsession means, please let me know... (And for all of you Freudians out there, he is only 2 so don't even think it deals with sex.) (And I already know it is his parents' fault so you don't have to give me that reason either...)