[Dean]

Number of miles is what is most likely telling as well as condition of the paint on the struts themselves. Chrome finish on the rod itself should be unblemished.

You can test the struts yourself. Pull off the springs and put the hat back on. Put a specific weight on each and time compression.

I think they are pressurized, so time the rebound as well. They should rebound fully.

Repeat on a couple different settings. Both fronts should match as well as the rears. spring on each end should also be the same height at rest.