Worth a try?

I know I have at least two hens laying, one was laying underneath a hay bale and the other has been a mystery last week until today when I emptied the donkeys straw feeder/manger and found 4 eggs from my Poland. They can only have been from Thursday onwards as I emptied the manger fully then but every day since then I've looked and no eggs but seems the eggs had slipped to the bottom.

Wondering if I should try incubating them or would the temperatures have affected how fertile they are?

Its still cold in the UK but they have been at the bottom of a hay manger and wrapped up and safe.

Worth a try or start from freshly collected and stored properly?