Rogue hen!

My neighbor called me today to say one of my hens has been hanging around her porch steps lately and may be leaving eggs there. I went to take a peek, and sure enough there were 8 eggs in hidden in a spot just under the porch steps. The hen isn't broody, she just decided she likes that place better than the nest box. Which leads me to these questions:

How do I break this bad habit? I am guessing I need to confine the rogue hen to the run for a while, but for how long?

Are the eggs safe to eat? Four of the eggs were cracked, so I tossed them, but the others were surprisingly intact. I live in CT, where there is still a ton of snow on the ground and night time temps have been below freezing. The last couple of days have been in the 40s and 50s. I hate to throw out those last 4 eggs if they are safe to eat, keeping in mind that the oldest one could have been sitting there for over a week (although I would imagine the cracked eggs had been frozen, so the intact eggs were probably laid over the past few days when things warmed up a bit).

I have 5 hens and two nest boxes. They don't normally seem to mind sharing, and sometimes I'll find two hens sitting in the same box -- next to an empty box, of course -- and seeming perfectly happy.

Thanks in advance for any advice!

 

Thanks, I will try the float test. With the amount of snow we had, I am pretty sure the hen hasn't been going over to the neighbor's for more than a week and half or so. I've noticed one chicken recently wandering around over there and sometimes ending up in our front yard where I would "rescue" her and put her back with her friends so she wouldn't have to walk through the snow. So, I am fairly certain the eggs that weren't cracked aren't more than a week old. More than that and they would have definitely frozen solid and cracked.

Today none of the girls left our yard (so far). I will keep them contained for a while, at least until they've finished laying each day.