Re: finding queens / moving to bottom brood box
If you find comb with eggs the queen was in that box 3 days ago laying. Queens will move up into empty comb to lay easily, the problem comes in getting her to move down into lower boxes to lay. If the queen has brood in both deep hive bodies she will move back and forth with no help from the beekeeper, if she only has brood in the upper, then often the beekeeper must reverse boxes, to place the empty cells above her. If the weight of the deep bodies are more than you are used to handling, move frames between the hive bodies.
Remember, if you move frames of brood or empty comb, maintain the brood nest configuration. If it is cold, do not spread frames of brood by putting empty frames between them. Keep the frames of brood together with the frames of empty cells to the side. If all of the cells become full of brood or food stores, then add supers of empty comb if you have them. If you have no drawn comb, then you must make do with foundation.
37 years - 25 colonies - IPM disciple - naturally skeptic