Check that the margin is really plus or minus 30 years, because the number on the report usually means something different than people expect. Carbon dating gives you a range with a confidence level attached, so a result might read as 2300 years old plus or minus 30 at one sigma, and that same sample at two sigma could stretch closer to 60 or 70 years. Those ranges also assume the sample was never handled with oils or resins and that the calibration curve itself fits the region. Curators do check the raw lab sheets, but most of the checking is about context and chain of custody, not just the final number.

Wait, a ground strap that crumbles just from bending it near the firewall? That is wild. I have seen crusty battery terminals all day but a cable that looks fine on the outside and turns to dust inside the jacket is a whole other level of scary. That means the thing was basically hanging on by a thread and the owner had no clue. Guess I am bending every ground strap I touch from now on, that visual alone is worth the extra minute.