I'm in two minds on this - the bank does need to know that its communications are being received

But, they have no idea if the paper statements are making it to your desk, or if they are getting swiped from the letterbox (I'm in an apartment in Melbourne, and the snail mail is not reliable at all, mail is sometimes delivered to the wrong building, sometimes the wrong address entirely, it's also swiped by miscreants who have nothing better to do, and, in some cases, the pricks set the letter boxes on fire, taking all the mail with it)

If the bank really needed to know that its communications are being received, they would send them in a way that would reliably return this information (signature-confirmed postal mail). It's very unlikely that the bank actually needs to know this information.