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I recently removed some asbestos tape around the windings of a phono motor. I think asbestos was a go-to insulation in days past. I would think the enamel on the windings would char before the tape got hot enough for needing high temp insulation. I removed it outdoors while wearing a respirator that I had. I think about the person that might have your project after me. The damage asbestos causes doesn't show up for decades. Those sheets might have been there to protect the paint on the metal cabinet. Another reason might be to deaden sound vibration from the speaker. A lot of plastic radios have pieces of foam, felt or cork between sections to prevent vibrations. Its the invisibly small fibers from asbestos that cause the danger and they can be generated by just brushing against it. I would carefully clean out any dust in the cabinet while outdoors.
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