under surveillance Traditional Cache

Was on my way to go find an old cache to go 4x4 wheeling and noticed a cluster of surveillance camras in a odd spot so omw back I stopped and checked it out and realized it's for the park host I thought it was for the prison or something it was odd. So I was just hanging out logging my finds for the day and remembered I had a cache in my truck that was denied because of the location and environmental issues it had so I found a nice spot for it and came up with the name because of the cameras. It's not near the cameras you gotta think how do magnets work and where could one be used. Good luck and keep caching..... cheers