Watch the video in the previous post. The check can be done in 30 seconds and then close the hive. By now there should be eggs and maybe larvae in the cells and they will be very easy to see. If you see eggs and or larvae you are good. Close up the hive right away.
Failure to check for queen acceptance and the queen was not accepted, will with time, turn the bees to laying workers. Once a package has turned to laying workers it is more or less doomed to failure.
|eggs in cell|
|eggs, that is pollen stored on top and the glistening fluid is nectar above the pollen|
|This is what a frame from the first delivery should look like about now|