well some of them kept them in the springhouse in the coldwater and that gets pretty cold, probably colder than most fridgerators now. my refrigerator is around 38-45ish so not too cold for fertile eggs. i dunno but i like it done that way and i'll continue it. I have seen the eggs before i set...
i've been hatching refridgerated eggs for years! all i do is set them out a day before i put them under my hen, they all hatch. I'll be honest i believe refrigertaed eggs hatch better than eggs that have been room temperature for a while, just in my opinion, its a old trick to keep the eggs...
fertile eggs will last for a while! trust me! I had turkey eggs sitting in my garage for a month before i set them under my broodie chicken, all hatched but 1 and it wasn't even fertile! i'd say guinea eggs are the same way, and you can even put them in the refrigerator while you collect them...