Unless Mac OS X 10.7's autosave system created a copy of it, no. While other software provides autosave functionality for iWork, all such programs need to be installed at the time the document would otherwise be lost.
If you are using Lion autosave will save the documents periodically if you have saved it at least once. If you never saved it, Lion doesn't know where to save it. There are third-party solutions that work the same way for earlier OSes.