Hi Geo,
I do not know what the Iconos can do with a box. It will be good if Iconos tells us what to expect for response to a metal box and other kinds of box that has treasure inside.
If we are talking about a LRL that works on the principle of ions in the soil, or from eddy currents, then a sealed metal box will be seen only as the metal from the box. If the box is made from cardboard, then I think we will see only the gold, but no box. In a plastic box, then ionic will see nothing, but eddy current detector will see gold. In a wooden box long time buried, if the wood decays to let ions pass through, then maybe you will detect gold with ionic detector. And for certain you will detect gold with eddy current detector if it is in range.
Maybe when it is good weather for treasure hunting, you can learn how Iconos responds to a box if you recover a box with other treasure inside.
Best wishes,
J_P
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