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And yet another way

I am assuming each object is surrounded by transparency in each Layer yet could work with slight modifications to this approach if not

1) Create a blank Layer and fill with white (arbitrary pixel filled Layer) and turn off visibility for that Layer

2) With Layer of desired Object selected, use Cmd+click Layer thumbnail (Cntl for PC) to select the arbitrary shaped object

3) Select Crop Tool (it will provide square around object)

4) Make sure "Delete Cropped Pixels" Option is turned off and type Return (enter on PC) twice to accept the crop

5) Cmd +A (Cntl for PC) to make selection around object

6) Use Image > Reveal All

7) Delete filled arbitrary Layer from #1 if desired)

You should now have the full original image with a rectangular selection around the desired object.  The filled arbitrary Layer is needed because the Reveal All step will not enlarge to the original dimensions if the crop only involved transparent pixels.

This works for my anyways and hope it is of interest

John Wheeler