Originally posted by Satamax
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Nickel is magnetic, but nickel covers are really made from copper, with some nickel and zinc. Copper and brass (which is copper and zinc) are non magnetic. Non magnetic covers still produce eddy currents, which produce magnetic fields that interfere with the pickup.
The thicker the case, the more eddy currents. Also the area matters. If you cut the case in half, you would eliminate a lot of the eddy currents. Or make it from many thin layers laminated together.
Possum had a good post about sanding a cover very thin. That's what we need. Thin metal covers.
A truly almost transparent cover would be nickel plated plastic.
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