"Weak 5" 2005 Proof Lincoln Cent

Hello, all! I just received what I've been told is a "weak 5" 2005 S (proof) Lincoln Memorial cent.

I haven't been able to find any information about this variety, and I've no idea where to look. Any ideas?

Edit: As requested, the now infamous (to me) 2005 "Weak 5" Proof

Here is a straight-on of the obverse. Not much to see:


Here is an angled view of the same coin, showing the "Weak 5", and perhaps some of the 0 next to it (no, that's not just strange lighting or a shadow or a dark reflection, it's a significantly, 50%+ less pronounced strike on the 5):


And here is a zoomed, color-enhanced field of the same photograph above, just of "2005":


It's a stretch, tough to see, but it is odd and not quite right.

Now, does anybody know where to find information on this strange thing? Thank you!