I just brought in our mail and included in the usual stack of junk was a letter from the PA State Constable addressed to the last owner of our house. It's in a really thin envelope so I was able to read that it says "FINAL AND ONLY NOTICE BEFORE ARREST." So, what do I do about this? Do I just mark it as "return to sender" tomorrow? I'm obviously slightly concerned because someone thinks that the old seller still owns our house (which we purchased over a year ago). We're wondering if we have to worry about someone knocking on our door looking for the old owner? Thoughts?