This is the 4248th most frequent Japanese word.
何やら
"何やら" means "something; for some reason; somehow."
In this sentence, '何やら' expresses an indefinite feeling or perception about the situation, implying that the exact reason for his enjoyment is unclear.
彼は何やら楽しそうですね。
He seems to be enjoying himself somehow.
'何やら' in this context introduces an unspecified or vague reference to the documents, making the sentence sound less direct and more conversational.
何やら書類を持ってきましたね。
It seems they brought some documents.
Here, '何やら' conveys an undefined impression of noise within the room, highlighting an ambiguous or subjective observation.