More than likely, you are stressing over nothing. ESP changes headstock logos on guitars every once in a while without ever making any mention of it. If anything, the drop shadow one is much nicer looking than solid silver.
Thanks. Im not hugely concerned. Im just a total guitar nerd who needs to know the insignificant details about his instruments. The funny thing is when I was looking at the various NT7 pics I could find before I bought this guitar I was looking at the logos and actually saying "I wish these had the drop shadow logo" and then this came and to my surprise it has it. So trust me Im actually more excited than not. Just surprised is all.