Don't pry apart every keyboard that you find! If you find an older model keyboard try removing one of the keys to see if it's a mechanical keyboard. If so (like a IBM Model M for example) they can be worth a lot of money. Mechanical keyboards are coming back in popularity for their tactile feel and durability compared to rubber dome keyboards.

A good way to see if the keyboard is mechanical is to listen when you press down the keys. If they make a click clack sound (for lack of a better term) when you press them down then you may be in luck. You'll want to remove one of the keys (gently!) and see if there is a mechanical switch underneath. If the bottom of the keycap is cylindrical in shape and goes down into a hole when you press the key then you have a boring old rubber dome keyboard that's basically worthless (although not always the case, but that's another topic in and of itself) and you can probably get rid of it.