Might be worth purchasing a game camera and strategically placing it in a place that could catch the possible perpetrators if they ever return. I'm sure Wal-Mart has cheapo ones, may not work well, but it'll be cheap.
If it turns out that somebody is purposely doing this you'd have evidence to share with LE, without it you're stuck speculating what the cause is. While implausible based on your description, there still could be an alternative explanation for the observed damage.
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