Tell them to show you a a copy, or a printout of the Question Box from the CD.
If they use the excuse that they don't have a WT CD, use psychlogical warfare to coerce them into asking someone else to print it out for them.
You have done your bit, you told them exactly where to find it. It is up to them to prove that you are a liar by producing the document they deny supports your claim. Why should you produce it? You might have a forgery from some evil apostate who is trying to fool you.
Personally, I prefere to take on subjects that I know they have the documentation for. I much prefer they show me docoments, rather than me show them something, especially printouts.
My wife might have a copy here, but it is VERY inconvenient to scan it at the momoent.
Cheers
Chris