Always check your suitcase for any signs of damage the moment you land. Luggage warranties don’t cover you against airline damage so it’s advisable to inspect your suitcase and report the damage to the respected airline counter at the airport.
Inspection
Adjust the trolley handle up and down to see it hasn't been bent, broken or jammed.
Push your suitcase back and forth to make sure the wheels are still in tact.
Inspect your zips and condition of your suitcase for any signs of tampering or damage.