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I've restuffed a lot of late 40's capacitors, about 90% of them are dried up inside with the electrolyte turned to a white crystalline powder and the Aluminum foil is rotted and deteriorated. They often would still work to some extent, but no way were they okay.
Normally they would be damp to actually wet inside.
Low leakage is one part, but have you checked them for capacitance? I suspect the deteriorated ones have lost a lot.
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