When my brother was around 9 or 10, he had an alien themed birthday party. We had all kinds of decorations and creepy music like the X-files soundtrack playing, but my favorite part was the Roswell alien head chia pet my mother used as a centerpiece.
Because we were Weird, we buried the whole thing in the backyard after the party. I don’t remember why. It was just a thing we did. To my knowledge none of us dug it back up, and my parents sold the house a few years ago. Did you move into a house in New Jersey in the last year? If you did and you find a surprise alien head at some point while gardening, then congratulations! You’re probably living in the house I grew up in! If you haven’t found one (yet!), you really can’t be sure there isn’t one until you check. Happy digging!