I think you have it, we'll never know. But anything with a mismatched inlay will forever be suspect.

I loved the part about having it checked by the casino. Maybe they are the same people who would be grading expects for slabbing?

That still leaves a $25 chip with a missing inlay to be found...

What was it someone once said about ugly cheap Hot Stamped chips? At least there won't be questionable error chips like this one.

Borgata $5 with $25 inlay on the other side, $5 color chip.