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A mystery letterbox is a good activity that is done outside which is fun for all ages. This makes it a great family fun activity. Not only does it permit you to be outside in the fresh air, it exercises your mind by looking to solve a puzzle. If you aren't familiar with letterboxing, it's actually a hobby of sorts. It moving on the moors of England now has spread on the U.S. along with other areas of the world. Basically, a letterbox is really a container you discover outside somewhere. A common destination to hide them is in parks on trails. What's inside this m