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Is the gold on the inside of the ceramic envelope thick enough to bother sending to a gold refiner?
Seems similar to extracting platinum from catalytic converters, so I wonder?
They were from the per 1972 times when gold was laid on the pcbs thickly...

What is a good way to strip soldermask to expose the gold for acid to get at?
NaOH comes to mind but... I would not want to dissolve a bunch of lead/tin/copper, then put it on the ground...

I just want to send all that to the processor as "plated copper" + solder + FR4.