Eggsactly...just happened to me today too, found 3 eggs! One hen was in the box this AM, not sure yet if she is the only one laying, it's been raining here for 48 hrs so it's the first opportunity I had to really check. Now time to pay closer attention, yahoo!
Winter could be an excuse, laying has more to do with length of daylight I believe. Some people who use lights for heat get hens to lay throughout winter but it does wear out the hens. My layers-to-be are not old enough to lay but that doesn't stop the roo from mating, the boys are opportunists :)