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Select the small surface (see image on the right) and choose "surface---edit tools---shrink trimmed surface". This will make the lines on the small surface visible again, which makes it easier to work with.

This is how the shrinked surface looks like:

Join the small surface with the lower part of the extruded part. This shape is our button.

Hide this button-shape and use "surface-edit tools-untrim" to untrim the hole in the mouse. This is a command which is very usefull!

Hole is gone:

Mirror the extruded part again from the other side and now also difference this out of the mouse.

Fillet these edges:

Unhide the button and mirror it

Also fillet the top edges of the buttons.

I created the buttons in this way, because I wanted their top surface to match up with the mouse shape. That's why I used the mouse shape to create the buttons top surface.

Assign colors, materials, place some lights and render.

Rhino can export its models to almost any other 3D package. This is a render made with 3DStudioMax and the Vray plugin.