NC waiting period for abandoned unit?

[Chris C.]

I have someone whose rent was due on the first, they didn't pay. Their number has been disconnected, and it looks like they moved out. One of the neighbors said that the perosn's family had come and moved her out. However, there is still stuff left behind. 

How soon can I go in and make repairs? Can I just put a notice saying hey, we're coming in XYZ day to do maintenance, if there is a waiting period(as that would be proper notice if she still lived there)? Do I have to wait any amount of time before removing the left behind items?