So, good shape means what?
Bring a feeler age that has blades from .003" to .006"
Bring a small led flashlight.
Bring a good ear, and request to go into the office or someplace quiet to listen to the action. Slowly cycle the action and listen for consistency in the noises from position to position.
Then, cock the hammer and insert the feeler gages and check that the gap on lock-up is between .003" and .006" at each position. The lesser measurement will be rare. More likely to be near the top end, but each position should be pretty much consistent. Shine the light on a white or light colored background and look at the background through the chambers. Do not directly illuminate the chambers or you'll see "too much" and the light will actually hide the annealing that may have occurred as a result of lots of hot loads. Annealing is not desirable, but does not necessarily disqualify. Often, annealing will go hand in hand with bigger gap readings. Annealed steels will have a rainbow color. Next, look at the front of the crane and see that the machine facings match perfectly. The crane should not have a gap or be more open at the top than at the hinge pin.
That's about all you can do as a customer without having the gun detailed by a smith.
If you find nothing , you should buy it and be happy. In good shape, it's a 700+ revolver these days. I've been offered more for mine.