Mr. Andrews,
I agree with your assessment; however, it does have a ring of truth in what Bogg's other comments suggest. But without the sourcing, we are left with nothing.
The closest footnote, which wasn't attributed to the quote is the January 27, 1964, meeting published by Weisberg in Whitewash IV, p. 53.
I sense another dead end.
Haven't had those sources out in a few years~grin.
Dave