I found the box described in the fourth installment in the series [0] most interesting.
In the first 3 installments, he speaks of the original box he made for some friends as a wedding gift. It will only open when the GPS detects that it's on a particular island, at which point they get the goodies inside. The box in installment #4 is based on the original, but with the intent of being reused or regifted. It has a USB port that, with the proper password, allows it to be reprogrammed to open at a new location.
It would be tempting to put a USB drive containing the software for reprogramming the box inside the container, and ask that it be passed on with a new gift once the first person has figured it out. It could be a gift that keeps on giving!
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I found the box described in the fourth installment in the series [0] most interesting.
In the first 3 installments, he speaks of the original box he made for some friends as a wedding gift. It will only open when the GPS detects that it's on a particular island, at which point they get the goodies inside. The box in installment #4 is based on the original, but with the intent of being reused or regifted. It has a USB port that, with the proper password, allows it to be reprogrammed to open at a new location.
It would be tempting to put a USB drive containing the software for reprogramming the box inside the container, and ask that it be passed on with a new gift once the first person has figured it out. It could be a gift that keeps on giving!
[0] http://arduiniana.org/2010/02/puzzle-box-opens/