I suppose you have this one ?

script: /* Show naked edges */ var gd = moi.geometryDatabase; gd.deselectAll();
var breps =gd.getObjects().getBreps(); for ( var i = 0; i < breps.length; ++i )
breps.item(i).getNakedEdges().setProperty( 'selected', true );

if it show all edges maybe all your edges are naked!
Try Edit / Join and relaunch it

you can also post your 3dm! ;)