The mirror and strong light are needed in any event to check for loose braces before you tune the thing up. If you see the same grain pattern inside...
The OP is, perhaps, overthinking things. Much more likely in wooden instrument aging are more macroscopic effects like fracturing in glue joints and...
This is a simulation, because it’s soft copper, but the same thing can be done with some of the harder materials. My turning rolls at home aren’t as...