Strange little egg!

[KrisNicOch]

Walked out to the hen house this morning, and saw this strange little eggs sitting in the box next to my Easter Eggers blue egg. Any ideas on what it could be? None of my seven currently laying hens lay green eggs. I do have to 14 week old Easter Egger pullets but they're way too young to lay right? Could one of my hens of brought a wild egg they found in the box with them (they free range) ? Could my Easter Egger of laid this with her typical blue egg? Here is a pic

 

[KrisNicOch]

Here's the eggs next to each other

 

[KrisNicOch]

 

[KrisNicOch]