many years ago, one of the hardware mfgs dropped 100 hardware and did an extensive testing after each drop and discovered that almost 90+% of the dropped gear were fine but then you got the few which did not.

Aluminum is not a metal that you can easily detect internal cracks or signs of stress by visual inspection. To be able to see stress factors, you must use an x-ray or do other test such as ultrasonic which YOU do not have at home so what is your life worth?