first eggs yesterday

My 32 buff orps just turned 19 weeks old on Monday, I hadn't even put up their nesting boxes yet, thinking I wouldn't get any eggs for three or four more weeks. I was it shock when I looked down on the ground inside their run and saw a egg about the size of a golf ball. Then I searched the coop and found one more out in the open and four more under their poop boards (slanted 3 X 5 sheets of durorock tile boards ). I don't think we will eat any of these eggs because I can't be for sure when they were laid,( how long can the eggs stay in the coop before they go bad?) I'm almost certain that they were not there on Monday. I can tell by their cones and waddles that a few (maybe half a dozen) are more advanced that others,but I never thought I would get eggs at 19 weeks. I put up the nesting boxes yesterday after I found the eggs, hope they use them.

Buffs only