They haven't gone anywhere.
Pages '09 has less shapes than Pages 7.0. It is one of the few things better in Pages 7.0.
If you want the Pages 7.0 shapes add them to a document in Pages 7.0 then Export that document as a Pages '09 document and open it in Pages '09.
Be aware that will not be available via the Shapes menu in Pages '09, it will actually be objects.
You can get additional Shapes from various sellers in the App Store. Or draw your own. Apple's I've noticed are largely not drawn, they are just connect the dots, not bezier curves.