Mine says shipment 1 also but that's just because I also ordered a couple of bands also, which are shipping separately (marked "shipment 2"). Doesn't have anything to do with being in the "first shipment" or anything... Just that you have two (or more) separate deliveries coming.
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Lol you beat me to it by seconds! ;-)
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If you have multiple items it breaks things down into multiple shipments.
For instance when I ordered a new MacBook the extra cables I ordered were batched together in a separate box labelled shipment 2.
Lol you beat me to it by seconds! ;-)