They appeared one day in our mailbox. Two identical padded envelopes, each containing a single mysterious piece of plastic. The envelopes had no return addresses and their stamps were not cancelled. Each envelope was addressed to my wife -- in the city of Los Altons.
 What are they?
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Unable to answer any of these questions, we dubbed them The Altons and gave them to Henry to chew on. He has since sprouted antenae.
