True, the magnet is too thick
It doesn’t take much to pry it out and
Have a regular shell that fits properly

A magnet about the size of a dime is glued inside a standard shell and, oddly, there is no mated regular coin. The thickness of the magnet holds the shell away from your St. Gaudens coin by about half a coin's thickness ... causing a reveal that is too big to pass muster by even a visually impaired spectator. Also, the presence of the magnet causes the shell to tip from side to side as it sits on the normal coin, making a lot of noise and certainly disallowing anything remotely like casual handling. The shell appears well made but I strongly urge buying a non-magnetic version which should cover your normal St. Gaudens coins with only a very small reveal.