Pity it's the version where Tom says that no plaques are known to exist (instead of the updated version) that is now on the guide. He did a great job with what he knew or had managed to find out through research so errors would obviously be made which would be corrected as more information became available.
I never had (and still don't have) any problem with what Tom said just your interpretation and confusing of the issue in a couple of places. I also confused some information but stated that it was what may have happened, not what did.
I think I've found where Tom got most of the information from (about the gold plaque anyway) and there is more stuff mentioned that is of interest so I sent it to Richard. He can use it if he wants but it is entirely up to him.
If somebody can find the photo of the Playboy plaque then a massive gap would be filled on the guide (and in the book) so we'll just have to keep looking.