I'm gonna be as unpopular as a turd in a swimmin' pool...
I read about half the initial post by the OP with sympathy; then I read the rest of the thread (and the rest of his post) for its' (humorous) entertainment (to me).

It's obvious that a lotta folks don't know how dealerships are structured, with various writers posting the procedures they'd either take or expect in a "soured" dealer transaction. Several things come to mind, flooding my thoughts with an 'overlap' of "deniable" actions.

The OP "detailed" the car on the showroom floor looking for flaws and found one one the bumper which he leveraged for a $20,000 discount. (I didn't read the entire thread, but I got that far.) In his post revealing the discount he negotiated, (paraphrasing) he claimed it would have been a great discount had the car been pristine/"brand new". Somehow, this discount is no longer enviable because the flaws he couldn't find were revealed solely by documentation from the dealer(!!). HE couldn't find it, and an inspection by a professional painter didn't find any flaws in the repairs.

I was an auto-painter in NorCal's largest Chevy/Honda/Lexus dealership for a spell and painted cars for 12 years. I taught auto painting as a course at the local trade school. I've got experience writing repair orders, assessing damage, and dealing with transport/lot damage. As much as there is outrage over the business practice of unreported repairs, it is not only common, but legal. I wouldn't doubt it if it was claimed that 20% of all the paint work in my former shop was "transport/lot damage". Shipping is different now, but back in my day, they were shipped on open railroad cars. LOTS of vandalism damage from rocks, eggs, etc. done by kids on the rolling stock.

Dealers don't separate loss by 'body', 'paint' or 'mechanical'... they're tallied as line items and totaled out; the owners only care about taxable profit/loss totals. On the showroom floor, only the (specific) shop foreman and the repair technician would ever know which car was fixed. Body/Paint repair orders don't follow the car to the floor; they're sent to Accounting. The sales force doesn't care how much the "overhead" was changed on a single vehicle, nor would they even know or hear about it unless it was common knowledge because of a spectacular accident/incident. Most, like the OP, couldn't find a repair if you pointed it out unless you explained to the viewer what s/he was looking at.

To claim that the dealership is somehow "liable" for some perceived slight is naive at best. (By "perceived slight", I mean that the OP never found any of the other repairs aside from the bumper; it took a pro to tell him that the documention confirmed what the pro couldn't detect--that there had been repairs done.) So... WHAT loss in resale value?? The Carfax didn't specify any body damage, the OP missed 'all' of it, and the pro he took it to couldn't find fault.

It was good for the morning laugh to read this thread; all his fuming and threatening, ranting about Euro cars, Ford, etc., etc. Jimmy crack corn. What's all that got to do with the price of a discounted white Corvette? Go to a gun store- how do you know that "new" gun hasn't been back to the OEM for repairs because the dealer found fault? (and you'll never know) Go to a furniture store... they'll never tell you if the showroom leather recliner had to be cleaned for transportation damage (grease, soda pop, mustard, anything)- it's all sold as new despite a thousand butts (and kids) testing/rocking the chair. Go to the grocery store and buy a jar of grape jam. Who's to say the lid at its' seal hasn't been wiped down with some dirty old rag because another jar broke and ants swarmed it for days until it was detected- buy a can of soup... who can say absolutely that the employees in the back haven't stood on the cans climbing inventory to get to something else that was stacked higher? Still sold as new, and for most ya'll, you opened it at home without a thought as that lid top that falls into your soup has been walked on by shoes that have been who knows where... "new".

Yeah, it's a $60-100,000 car. Flagship and all, "I'M BUYING A CORVETTE AND I EXPECT MORE". Um, I don't think so. It's a commodity; sold for profit by strangers to strangers. Laws have been created to define minimal sales conduct; whether the potential buyer likes the idea of undeclared "refurbished" goods or not, it's legally ethical to repair damaged products (up to a point) and sell them as new. And when he missed it all and thought he was getting a deal that even Carfax didn't reveal, it was all good.

Ah, entitlement... as a former professional painter with a completely different insight, that what it seems like; and the "complaint"/responses were a lot of fun to read. Flame suit on.