Classic Series security cradles? (82007A and 82015A)?

[Siegfried]

I recently bought one (with box) and the biggest advantage of making it yourself must be that you don't have to deal with the dust that is all that remains of the foam padding inside.

My main reason for buying wasn't security but I think it's quite a curio as the need to protect pocket calculators from being stolen from your desk during the working day seems a bit strange these days. (But then, my HP15C left on a flight deck about 30 years ago, was never returned to me either.)