I would test out all the ports, the camera, the built in mic, etc. Do it again after a reboot.
Also, examine the display under a light to make sure there aren't scratches or spots. Test it with the thing on as well to make sure there are no [unacceptable] dead pixels or weird uneven spots. There are programs or websites to help you do this.
If everything seems to work fine you are probably good to go.