Yep! Magnetic reed switches! Test them to see if they are "Normally Open" or Normally Closed" switches and then put them on ebay! If you bring a strong magnet close to the side of the switch they will either open or close depending on switch type. Should bring WAY more than metal content! And! If you don't want to mess with it...shoot me a count and price and I may be interested!
Reed switches are neat. I have a bunch of them from the '70s when they were fairly common. I would definitely put some up on fleabay. You should get a good return.