Try not to use direct reflection from sunlight.
It will be difficult to control the light source.
If you use this method, the only way to get the toy becoming bright will involve shinning from the front. The black background will 100% show up.
Try to use you light box. Use light to shine from the 2 or even 3 sides. Try to avoid shining any light onto the background.
Try to adjust the aperture and exposure time.
Remember to change the EV to -ve valve. ( white=> +ve)