Just as a waypoint, my 2007 SM has ghosting on a number of inserts. I'm not sure when it happened, but this pin was originally in a house by a lake with rather big temperature swings (throughout the year, and even throughout the day).
That said, the other games that were at that same house for approximately the same amount of time have no ghosting.
The integrity of the clear around the inserts on our SM seems solid, aside from the visual ghosting.
Not psyched about this ghosting out of the box crap. It's keeping me from buying a NIB MET. I'm not selling SM, it stays in the home collection. MET would go to my location, and I'd most likely swap it out at some point and don't need that additional hit on the flipside.