There are certain traits required to be a good cacher. The ability to think 'outside the box', turn on the 'eagle eye' when needed, always be conscious of Mother Nature, and develop tools of the trade from what others may throw away.
Check this out - do you recognize this. If you ever did the Spam routine when you were young, you do. This is the type of 'key' that was used to open the can. It came attached to the top of the can. Now, it is a pull tab.
Always keep your mind open to special caching uses of odd it