I actually don't have it anymore but still had a pic stored away. From what I recall they had some dashed numbers imprinted/cut into the insert in the same way as the tie interceptor insert has.
I could be wrong about the numbers but it just rang a bell. If the insert looks machine cut and folded its probably ok. I would think a lot of the tri-logo rancors have their original inserts still as they were a fairly tight fit in the box.