Good idea. In fact the survey was sent to an obsolete mailing address that is no longer the street address of her house. Post office had her change it a few years back due to some obscure zoning issue, I believe. So she can make a case that she didn't receive it. Even the 9-digit zip code is wrong.
It would be a real shame if she got a ripped envelope with the document inside water-damaged or missing.
A real shame.
Just sayin’