I don't think they'd be seams - if they are anything, they are supposed to simulate "wrinkles". As was pointed out, there aren't supposed to be seams in that costume. I can definitely see wrinkles in those same spots in the DCD promo pics.... you'd just think they'd be upraised and not engraved to look like seams.
The pic on the box looks pretty similar to your pic...
There's some more pics in this thread.... I'm guessing it's less visible from a distance or when a picture is taken with a flash.
http://www.statueforum.com/showthrea...t=silk+spectre