Oh, well that's funny. The picture on the listing shows it having a hole, but the review says the hole was missing on his, and he had to drill it out. Cheap crap sometimes that's not made right from these small suppliers who sell on Amazon. I ordered a laptop power cord from a cheap Amazon supplier like that, and it showed that it was a three pin grounded plug, but what I got was just a two prong, non-grounded one. Yeah, might need to drill yours out too.
I wonder if the one I recommended from EVSEAdapters would have had that issue.