Hey guys, I noticed this too. Is this something I should be contacting CGC about? There's a very small rectangle spot that looks like it may be some sort of glue or sticky stuff on the inside of the inner well. I can tell when the comic moves, there's a spot on the comic itself that is much fainter, but whatever is on the inner well is leaving a mark of some sort. The whiter rectangle stays fixed.
Here's an image, with a circled blow up of the area. The red outlined area is on the inner well, the green outlined area is the faint spot that's now on the comic. What is this? Could the inner well have something sticky or some sort of glue on it when they put the comic in it? It appears whatever this is has now marked the comic, and I fear as the comic moves about slightly in the well, it's just going to stamp more of these spots over time.