Treat this as a valuable lesson, that's about as much as you can do at this point. Used car buying is a gamble, especially if you have to rely on others to tell you the condition of the product.
However, if you bought Toyota certified pre-owned that means you have an extended Toyota warranty. So, keep on driving and monitor the situation. If it gets worse or louder, record and bring it back to them.
Recording any wired noises is quite helpful and any dealer worth something will not dismiss it. That's how I got the HVAC blower replaced in my minivan. The noise was happening under rare condition and I recorded it. My dealer replaced it based on that, no other diagnostics were performed.
However, if you bought Toyota certified pre-owned that means you have an extended Toyota warranty. So, keep on driving and monitor the situation. If it gets worse or louder, record and bring it back to them.
Recording any wired noises is quite helpful and any dealer worth something will not dismiss it. That's how I got the HVAC blower replaced in my minivan. The noise was happening under rare condition and I recorded it. My dealer replaced it based on that, no other diagnostics were performed.