The orc-raid on Amon Hen was launched primarily by Saruman, though, no? I don't think you can assume that Saruman shared his intel with Sauron; on the contrary in this case. I'm thinking the Mordor orcs were vectored towards the Fellowship by the Nazgūl who Legolas shot down near the river. What's the word on the osanwé link between Sauron and his Nazgūl minions? Would he know what they know (or suspect) as soon as they know it, or do they have to be "within range"?
All this may be bunk. It begs the question of how a raiding party composed of Uruks, Moria, and Mordor orcs came to be formed.
EDIT: Cross-posted with Fordie, who makes some interesting points.
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