Bro I've mention in my thread #12 pls read. Oh ya btw approach Jason and he will tell u how to test focus, request for demo for all ur enquiries, I spend 2 hour there just to buy a dslr.
The most important is to see set the date and language urself, nikon warrenty with nikon sg pte ltd, visual exterior check that's it. I didn't check much also and Jason even show me how to see shutter count. So u need not worry, follow rashkae bro advice and ask Jason to demo.