I am not sure about the law, but if you are going to install a lock, even though you think the sheriff will come in a few days [check to made sure when they actually will come], since your tenant obviously is a big problem and will use anything she can against you [which is why you have to get the sheriff to evict her], do not tell her that you are getting a lock because you think she is stealing your mail, tell her someone is so to protect your mail you are getting a lock but you will check the box every day and immediately put her mail where she can get it.
Answered on Jan 25th, 2016 at 5:24 PM