Bahahahahaha LOL ok...highlight/select the WHOLE model....then hit extrude, when you have extrude in the scene...hit the BLUE circle..(experiment)....then hit one of the coloured cubes, this will produce a BLUE cube in the centre of the tool...this is basically an extrude/scale.

Experiment.....you have to play with Maya and its tools like I do to learn mate. Im here to help in my capacity but Im a noob too. Play with it...se what it does..etc.

Have fun, bullet

PS I was planting more vegetables in my potted garden...sorry for the delay. AND your box/carton looks good!!