You would never be able to see if it is overstressed.
In extreme cases you can tell like very hard landings but other then those....no.
Hmmm... Disagree.
If you've ever seen bent metal, you've seen stressed, or overstressed metal.
I have seen aircraft with bent metal, and sheared rivets. They had been overstressed, though usually a result of contact with something harder than just air.
When I fly a Lake Amphibian, I can pull 2G, and see a whole lot of compression wrinkles form on top of the wing. It was stressed - but not ovestressed - they went back when the [within limits] stress was removed. If they did not go back, I would realize that I had pulled a lot more that 2 G!
For an aircraft structure to fail in flight, either a manufactured joint has to open, or something has to crack open. Manufactured joint opening has been known, particularly fuselage tops peeling off B 737's, but they are a very different case than a GA aircraft. Cracks do happen in GA aircraft, but rarely from initiation to release in one or a few flights. One of the many premise of light aircraft design is that cracks will be seen long before they create a safety concern. It does not always work, but it does work much more reliably than pilots keeping the tanks full!
they may not even find anything
Then likely there's nothing to be found - it's safe. Aircraft and inspections are carefully designed to assure that any meaninful defect
will be detected before becoming unsafe.
Of course, take care with pre flight inspections, but more for hangar/ramp rash risk, that the remote chance you'll pick up an undetected structural fault.