Not sure what your breeding experience is but before giving that kind of advice you might want to do a little more research, no one palpates near lay date nor would it be helpful, actually you want to avoid palpating once the animal ovulated (and there is no proof that the animal did in this case, the animal was more than likely just building up and they will shed during follicular development.This method is very helpful as they near the lay date. Fertile eggs will feel soft, squishy, and marshmallow like while unfertilized eggs will feel hard.
People palpate to feel for follicles not eggs.
Yes and no slugs may feel hard however unfertilized eggs with no vein structure will feel like any normal eggs.unfertilized eggs will feel hard.