So far, all the models available for download are in other formats!
That is most likely because there are few Vectorworks users on the site. This is only a guess though, I've never seen or heard of Vectorworks.
What formats can you import? If it can open common formats (step, iges, parasolid, SAT), I'm sure one of the containers could be converted to a suitable format if it is not already in available.
List the formats you can import, and include a link to the container model.