Why would your neighbor know that rake was there?
He walks out and looks around the fence to verify that its there, it seems.
Is your camera a wireless unit?
IF so, it needs some sort of improvement for privacy (is encrypted signal an option?)
Does your neighbor own the same brand of cameras?
Most wireless cameras just broadcast your life for everyone else to see.
Often, All they need to do is to buy the same brand/model of "security"(?) camera from costco or whatever other local retailer has dozens of the same cameras.
Look up "war driving" with common camera~wireless receivers.
The internet used to be loaded with sites devoted to things picked up from neighbors wireless devices.
Common, "off the shelf" unsecured Baby Monitors have been a source of friction for many people too.