100%.
I spent too much time attributing chips to take someones word for them.
I always ask a seller, what proof do you have?

There is just way too many attributations in our books that chip sellers put a name to without any proof.

I have been researching the LVM arodies since 1998. I have been roughly 90% sure for a number of years. Several people involved at the casino IDed the chips. But a lot of old timers tell you what you want to hear.
I have had many collectors ask me for the info, I declined to tell them what I knew. IMO 90% was not enough to put it in the books.
Guess what? I am meeting an old timer that worked there in a few days. He says he has some he walked out with.