[mothered]

Im thinking about partially empty box it, would it work even if they have cctv in place?
When opening the box, i did it from the upside down

You mean you're Intending to MEB It?

Should i seal the backside with some matching tape?  as if someone opened it and stole the items while in transit?

What are the chances of that "someone" having matching tape on hand when they stole It In transit?