I just had to toss a dozen eggs that were 10 days into incubation. All had candled clear. When I opened them I found infertile eggs, but most of the eggs had the little meat spots in them...some had several. I know that isn't a dead chick, but is refuse from the oviduct, but would their prescence affect fertility of the eggs? If so then having the seller replace them really wouldn't help...I would guess they eggs would have the same problem.