lost a piece of piston...Stumped?

There may something funny with the picture, but the crown of that piston appears to be 1/8" away from the cylinder wall. No 4" piston, cast or hypereutectic or otherwise is going to grow that much. If the picture is accurate, that's the wrong slug for the hole.

I'm curious to see a picture of that piston out of the motor, and some measurements.