Ask HD for advice, he is great with neighbors.
Like mentioned, get them on camera and they can probably get charged with something
Im guessing there is a story behind this? Im going to put one out next week. Funny part is they were sitting by the window thats next to wear i put it at tonight i guess waiting for me. All they had to do was turn their heads right and they would have caught me dumping it back in their yard. Nope to busy watching tv.
That was my first thought, lal.
HD had a motorcycle for sale, had a guy come look at it who proceeded to drive off and steal it. HD, being the boss that he is, had a GPS sensor on the bike, so he armed himself with two 9mm's, a friend, and a truck and went into the hood of Philly (I think?) and retrieved his bike like a boss, with a bonus fake Rolex.
Not so much a "neighbor" issue, but you get the gist.
I will never live any of that down, haha. The neighbor issue was a two part thing 1) basketballs hitting my cars and parents not caring at all 2) me making my house purposely look like shit with 1ft tall grass and sitting on my lawn with beer, cooler, and lawn chair right where same neighbor's potential buyers would see me when they got out of their car for Open House when they put their house up for sale (to make their home harder to sell, it worked).
The bike incident was different, but my buddy that went with me to help retrieve it is a fellow mustang guy (met him at a car show in Hershey back in 2005, been friends ever since)....anyway, aside from him helping me get the bike back...the wives were busy this past weekend so me and him took his son to a car show/trick or treat show aka two dudes and a kid. His son won first place for best costume.
Pic I took of my buddy getting his son's wig perfect.
Ok sorry to get off topic.
OP, I would not do anything illegal to get yourself in trouble. Meaning, I wouldn't dump trash on their property.
Next time it happens, take a pic of said trash on your property, find something with their address on it, call police, show them evidence, and let the police knock on their door and tell them what the program is.