@kmichel, @bkh, after re-reading my notes, this is what I got from Dexcom when discussing with them in the past couple of months as I was preparing for our long Euro trip:
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the transmitter must be shipped to the customer within 8 months of the Manufacture By date (the date next to the factory icon on the box). The Ship By date is indicated on the box as SB
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the transmitter MUST be started by the customer within 5 months of ship date. If there is any debates on that, Dexcom goes by the date the insurance paid for the transmitter
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If that happens, then Dexcom warranties the transmitter for 90 days.
I was also told unofficially that, if you start the transmitter 12 months or more after the manufacturing date, you are very likely to run into trouble.