Matthew
Touchdown! Greaser!
I have had a similar problem. We have a neighbor with five kids, all totally unsupervised.
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After that, I'd just print out the pictures of the kids sneaking up to the door (sort of like a wanted poster) and emailed them to the local email list asking for them to be identified. Funny thing that stopped as well after that
That's something else to consider - Does the HOA have a Facebook page or other website where you can post photos of the trash and security camera pictures?