dupBorder only works on a mesh box in Rhino if you sub-select a face. Perhaps you are thinking of Silhouette. I’m not seeing any readily available to pull that info, maybe someone who works with meshes can chime in.
I see LunchBox is only for rhino on Windows while I use it on a Mac. Not sure how to install the package on my machine; it shows up as “lunchbox.installer.application”. Is there an alternative perhaps?