The Smugglers Penny

I was browsing the internet recently when I came across a coin that intrigued me. It was very similar to one my brother found a couple of years back, near an old Medieval church.  However he only found half a one.

The item in question is a carved out Cartwheel Penny - the one my brother found was a Twopence.

It has a clip on it, so it clips together to keep any goodies inside. Exactly what it contained is anybodies guess. Maybe a key?? or small change. Some even refer to it as a smugglers penny.

Has anybody else found one similar?