Extruded contours back to original form

Hello guys, I had designed a sandstone inspired set of shelves. In the middle of the process i needed to contour it and extrude those contours (similar whenever going to laser print). The problem now is that I deleted the shape that I extracted the contour of, and now I need it back or even something similar. Any ideas how I could reverse it?

What is the result we see? Are they polysurfaces?
In such a case DupFaceBorder or ExtractWireframe would get you the curves.

I don`t want the curves, I want the mass. the shape before it was sliced.

Sorry, Rhino has no automatic native tools that can reconstitute an accurate, smooth solid from contour curves created from it. Too much data is lost. If you can’t find the solid in another file, you have a Reverse Engineering task to grapple with.