Claim: A UFO crashed in 1933 Italy and the US Recovered it

[Eburacum]

The Caproni was a very early jet aircraft, one of the first to fly anywhere in the world; but it had poor overall performance, and very few were built.

But the name Silverplate was a contraction of "Silver Plated Project"

That's right; it had nothing to do with the 1942 event. Brophy senior seems to have a fabulist, who took tall tales from all over the place to elaborate his story.

Note that the bombers concerned were painted silver to reflect the blast of the atomic bomb;

 

[Ravi]

Note that the bombers concerned were painted silver to reflect the blast of the atomic bomb;

Nope.

The aircraft that dropped the atomic bombs (Enola Gay and Bockscar) were unpainted, bare metal planes made of polished aluminum. [1, 2, 3]
The US Army Air Forces stopped painting bombers olive-drab camouflage in 1943. Leaving the planes unpainted saved weight (which increased the bombers' range and speed) and eliminated drag. [1, 2, 3]
The specific Boeing B-29 Superfortress bombers used for the atomic missions were part of a secret modification project known as Silverplate. To safely carry the massive weight of the atomic bombs, these planes had their armor plating and most of their defensive gun turrets stripped out, which further increased their speed and operational range.

 

[Eburacum]

That's a better explanation; thanks.