I have never lost an item in the mail, and I'd imagine you're fine in this case, so I wouldn't sweat it. The CSSA recommends that PAL's get sent in for renewal nine months in advance. I send mine in six months before expiration, and despite my track record of zero losses in the mail, always pay extra to get a signature. It's worth the peace of mind for me as I don't want to be unlicensed for one second.