The default set of Eagle CAM job place the board oultine on the Silk screen CMP layer which has the extension plc. The outline is stored on Layer #20 Dimension as shown below.
You can place the outline on any gerber layer. Just deselect layer 20 from the Silk screen CMP layer, choose on of the other layer tabs and select the Dimension layer to add it to the gerber output. Once you have your updated your layer selections press the Process Job button to export your gerbers.
We have our own set of Eagle cam scripts that you can use and we provide a tutorial to walk you through the gerber and drill output process. You can download our Eagle cam files from the Sunstone Downloads page below.Sunstone Downloads
Go to the bottom of the page to the Additional Tools section.