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Lipo batteries should come 50% charged for storage, that way they don't degrade as much in storage. Fully charged batteries suffer capacity loss by a decent percentage every year. Allowing a battery to be stored at a low percentage is also bad... That's why it's kind of a bad thing when you notice that you get a device with a battery at 0% or 100%. If it's at 0% it usually means that something is defective and the battery was able to discharge. If the battery is at 100%, it means that you probably got a recently RMA/refurbished item, or they did some testing or updates prior to shipping - that was the case of my laptop.
In many of these devices with integrated batteries, they may just update the firmware and do diagnostic tests which take 1-2 hours allowing the device to charge (most of these tests require a power supply anyway, specifically firmware updates).
Anyways, most companies don't worry about it because they realize that the device will be used by the consumer after it is shipped, not sitting in a warehouse for months to a year, so no harm is done with a full battery.
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