Nissan dealer's suggestion is stupid. 6 weeks = it's not "working itself out."
The noise is unacceptable. A "certified" car with issues 8 months later that are supposedly due to previous owner's negligence is unacceptable. Either way, take it back and tell them to fix it. If the noise is reproducible they can diagnose and fix it. If they aren't willing to, then take it to another dealer.
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