I think it's really hard for a layperson to detect these. I've been checking for months my change and still havne't spotted a convincing example. Every blog or page explaining them requires generally deep knowledge around what dots should be where or what the correct symbology is for the issue year, etc.
It's lettering/patterns/quality on the edges that I find I can spot counterfeits for, and misalignment is a dead giveaway - see GP's first link for examples of that where it's a few degrees off, or completely reversed.
