What’s the angle behind using my address?

We have been in the house we built for 19 years. A few months ago, we got a piece of mail for a name we didn’t recognize, using our address. I marked it RTS, and put it in the box.

We are in an HOA, my street is a cul-de-sac of 12 homes, and we know every neighbor. The street name is also extremely unique, and we have 5 digit house numbers, so it’s unlikely someone meant to use 124 Anystreet and accidentally used 123 Anystreet.

It is now to the point where we get 1-3 pieces each day for this person. All the mail is related to our state’s Medicaid benefits program, though from different divisions/programs.

I have spoken to my postman directly, letting him know this woman didn’t suddenly move in with us, and to please stop delivering mail in her name, to no avail.

I just keep marking the envelopes RTS- unknown person, but it’s getting awfully frustrating.

What’s the scam here? Benefits fraud? School zoning address fraud? Or did this person just accidentally put the wrong address on one form and somehow wild fire ensued?

Thanks for any ideas.