James, @jimboman IF you send them in to Cardas, once they peel back the end jacket they will know quickly, able to help determine next steps.
If they are the real McCoy, they may tell you the older soldered XLR connectors are history. The conductors and dielectric inside may still be just fine. With the current [standard upgrade] option, they recut the ends fresh, install the newer/better crimp style ends, re-wrap the connector end jacket sleeve fresh, test and certify.
In this case upon return, if you still don’t like them, I bet someone will buy them from you now knowing they just came back from Cardas with an upgraded bill of health.