One option would be a tracker beacon which can be located with a directional antenna. Best if such a device transmits on a VHF or UHF frequency, and also connects to 4G data network and uploads its GPS location. Having last known GPS location would put one in range to precisely locate the item with a small parabolic or Yagi-Uda array antenna.

David

On Wed, 25 Aug 2021 at 18:29, Simon Green <mail@simon.green> wrote:

On Wed, 25 Aug 2021, at 4:01 PM, Michelle wrote:
> It would presumably use GPS. It would involve a very small device put in
> the parcel that a thief would very possibly not even see when the parcel
> is scanned at customs.

Your biggest issue is going to be how is the device going to communicate with the Internet (or otherwise tell something of its location). Can't use mobile unless you have a good roaming agreement. The second issue would be battery life.

> The icing on the cake would be if the route of
> the parcel was able to be recorded as evidence.

Most reputable couriers / shippers will use someone that provides online updates when it is scanned at each location.

> after I send this email I want
> to go to the site and see if it has posted.

It's posted :)
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