What is lock down you ask? It is the time that starts 72 hours (3 days) before eggs are due to hatch. If using an auto turner, the auto turner is turned off and the eggs are traditionally placed on their sides in the bottom of the incubator where they will hopefully hatch around day 16 (for button quail).
My current eggs were shipped in from another state. Bad things can happen to eggs in shipping due to rough handling such as the air cell being displaced or even broken. There are some things that can be done to help shipped eggs