I sat eggs in my incubator 23 days ago- some shipped (expensive) eggs and some from my own hens. ALL the eggs from my hens that made it to lockdown have hatched at least 48 hours ago. The 3 shipped eggs that made it to lockdown do not even have an external pip yet. I think 1 of the shipped eggs is dead, but the other two still have nice veining, however 1 does not move. The one that is moving appears to have internally pipped, but I cannot hear it chirp. I feel like I should help at this point (I have helped out chicks before, so I am familiar with the process), BUT I am afraid I will intervene too soon. Do shipped eggs take this much longer to hatch or are my chicks in danger? ANY advice is welcome, thanks.