We attempt to transport a water heater (still in box) to a rugged
location and drop it on its side. When unloading the water
heater off a Ford 2-ton truck it tips over and lands onto its side on
a pavement from 3-feet. A second attempt to move it on a
dolly resulted with another fall. It was a disastrous location to be
moving anything, it was dark, uneven surface, cold etc. There
appears to be no damage since laying it down or on it's feet
produces no sound of broken tiles. The instructions says to look
for hidden damages.What could damage or which panel should I
open to inspect for damages?

Thanks