I'm guessing you have a 2007. Many 2007 Camry owners have complained of interior squeaks and rattles. Most are fine, but if you're lucky enough to get one with rattles, it's annoying and depending on the rattle and dealership repair quality, they can be tough to get rid of.
There are TSBs for most of them. I thought there was one for the shifter, but I don't see it on the list in the sticky.
(CLICK HERE FOR TN LIST)
I had the shifter squeak/rattle shortly after taking delivery- the dealer fixed and it never returned. They put some felt down and 32,000 miles later it still hasn't returned.
Unfortunately, mine still has the original moonroof rattle a bit on really cold days (It isn't bad enough or frequent enough to request a repair per the TSB)... and my dash rattle has returned and is worse than ever. I'm almost out of warranty, and I plan on taking it to the dealer again soon.
Luckily, many people on this forum have no or very few of these problematic rattles or squeaks.
I guess it just stinks to be one of the few with frequent rattles.
If you search (It might be buried deep within the Gen 5/6 forum) for shifter rattle or console rattle, I remember someone did a self-fix and did a tutorial with pictures to show how they fixed it several years ago.
If your current dealer is unable to fix, I suggest you try a different dealer, or contact Toyota to see if they can communicate with the dealer a more effective solution.
Good luck, unfortunately a rattle or two can really take a really nice car like the TCH and make it seem like a piece of crap until it is fixed.