Independent of History.com, Fleming's 1956 novel Diamonds Are Forever does use a hollow-golf-ball smuggling device — corroborated by a Bond-specialist source, but not tied to Fraser-Smith by name

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Fleming's 1956 novel Diamonds Are Forever does use hollowed-out golf balls as Bond's diamond-smuggling device — a detail corroborated independently of History.com by The James Bond Dossier, a specialist Bond reference site run by named author David Leigh since 2002: "Bond acts as a courier, smuggling a set of diamonds inside golf balls. This was a device that Fleming had picked up whilst working in navel [sic] intelligence during the Second World War when messages were sent to prisoners of war inside the balls." This is Tier-3 evidence that the plot device is genuinely present in the 1956 novel (not only the 1971 film) and is understood among Bond specialists as lifted from real WWII tradecraft — but it attributes the technique to wartime naval intelligence sending messages to POWs generally, not specifically to Charles Fraser-Smith's Ministry of Supply/SOE work, the attribution claim-fraser-smith-real-life-model-for-bond-q makes via History.com and Fleming biographer Andrew Lycett.

Notably, Wikipedia's own "Diamonds Are Forever (novel)" article covers "Plot inspirations" in some detail — the Sunday Times diamond-smuggling article, Percy Sillitoe, Saratoga Springs, the Studillac — and cites Lycett repeatedly for other plot-origin claims, but does not mention golf balls or Fraser-Smith at all (checked directly the same session, not separately captured with a source_sha). That silence doesn't contradict the golf-ball claim; it means Wikipedia's own curated plot-inspiration list isn't independent corroboration for it, and the Fraser-Smith-specific attribution may be narrower or less settled than History.com's confident phrasing suggests.