Moving pianos is an art that takes practice. Before we move a piano, we collect plenty of moving blankets to cover several parts of the piano, and plenty of tape to hold them in place.
The blankets provide a layer of protection to the pianos. The covers provide a layer of protection for the pianos. For moving smaller items we usually use special moving boxes.
First, we cover the piano keys themselves with blankets, to prevent them from shifting and getting damaged in transit. After that, any detachable parts of the piano should be removed to be packed separately.