Renting Apartment - Scared of Neighbor unruly teen living above us?

Background info:

Location: North Carolina

There are 2 stories to the apartment complex and they live above us. For the first year it was a nightmare living under them, they were wrestling all the time shaking out apartment knocking stuff of shelves. We (included other people in the apartment) complained. This went on for a year. Finally the apartment manger did something and for the last year and half things been quiet.

Now, he stole a $90 coffee maker the wife order, that FedEx dropped off but left at the door instead of taking it to the apartment manager. He told a friend that he "found" it, wrapped it up and gave it to his mother for Christmas. But we cannot prove it, we heard it word of mouth. So i put a flier up about it the missing coffee maker and he tears it down each time after i put it up. I watched him throw it in the grassy area of the next apartment. I put the flier up so that maybe the mother will see at her odd hours that some comes home.

His father does not live with them, and we cannot talk to the mother because shes never home due to odd work hours. We told the apartment complex manager and they said nothing they can do without proof and that so far the havent done anything that breaks the rules of the apartment complex or that he hasnt been caught.

Also from word of mouth, it appears he has broken into someone else apartment by window stealing stuff from their purse and other items in the room.

We do have an alarm system but wife does not feel safe because of him. We cannot afford to move due to the possibility i may lose my job in 4 months may not be able to pay for everything with costs of moving, and we are in contract with apartment for another 6 months.

Is there anything that can be done legally about this teen, even more so since wife is scared of being along and plus she walks home from work (5 min walk from work) because i am usually at work when she gets off. She did order pepper spray to have with her and she sets the alarm after she gets home and txts me to let me know she got home ok.

If I tell the apartment managers about her being scare of him, would there be some action they have to take or do we have to wait until he does something else and able to prove it?

A person shouldnt have to be afraid to live in their home...