I've Committed Mail Sins

Mr A's the guy who used to live in our house. I call him Mr A because it makes it sound as if he's somehow related to Mr T and the prospect of having a relative of his live in my house before me, is more exciting than it should actually be to a normal functioning person. He's not a related however and his name is actually Mr Addy, but sometimes we still get his mail posted to our address. Not once have we ever sent it back though. I mean, should we have? There's a possibility that Mr A is dead. In which case sending him letters would be both pointless and rude. Like hey, we know you're dead and all but here's your mail Sir. Then again he could be perfectly healthy and really pissed off that he's missed 10 percent of his mail every single year for the past 7 or 8 years. Which is a rather long time to go without receiving your tax return papers Mr A.  And although I'd love to say that we've kept your letters Mr A ( assuming your reading this and that your eyes are still what they used to be) we haven't. So...umm... if you ever try to track them down. Mazel tov sir.