To my knowledge, you have to give notice to the FAA that you are opening a private use airfield. However, I have heard that some people do not do this. In the context of this specific airfield, it looks like it was registered at some point, considering the 5ND7 ICAO code. You can look up airfields on this website: https://adip.faa.gov/agis/public/#/public. I believe this information is only from airports that have had their information updated within the last 3 years. If you go to the top right of that page, under "Public Tools," you can click "Download Private Airport Report" for a larger list of airports that have not had their information updated within the last 3 years. But I am almost positive this airfield is no longer in use so it wouldn't be listed in either of these databases anyways. I wasn't aware of the whole Google thing so thats good to know.