Section 8 Tenant hasn't moved out yet

[Jacob D.]

My section 8 tenant sent written notice last month that they would be out today. They haven't moved out yet, and she hasn't made it clear when she will be fully out. What am I allowed to do in this case?

- Can I just go by tomorrow to change the locks?

- Should I reach out to their case worker?

- Can I walk into the apartment, and if they aren't there (but haven't moved yet) can I move their stuff into the basement?

I'm going to try the nice guy approach, and see what the deal is. They gave notice, and I confirmed with their housing worker that they signed a lease on a new apartment. 

Thanks for reading, and any help is appreciated