The box exporter is a different tool. It exports just boxes for making houses and the like, not sculpties. There's also a tri exporter, which like the box exporter exports triangles. Both are very good for sharp edged shapes that are tricky to do as sculpties, or shapes that are far too large to make as a sculpty, but they require more prims.
For sculpted prims, you need to use the sculpted prim export option.
Here's an SL-specific version of the wineglass tutorial:
http://www.independentdeveloper.com/...prim-wineglass
It's almost the same as the AC3D-general tutorial, but covers UV-mapping for SL.