As far as the Portland, OR area goes, one of the Dealer Preppers for this area in the 60's lives right next to our shop, his name is Jim. They prepped all New Fords coming in for All the Dealers in this area by Train. The Tie-Down Brackets were supposed to be removed by his service company before the Dealer ever even saw the car, it was part of 'Dealer Prep' . The Ford Incentive was $1 for every pair, so they never removed them, except for the occasional 'go-getter' however they were under a time limit for each car and it was just not deemed necessary. This is his straight answer, which at least covers Fords delivered in this area in the late 60's into the early 70's.
One thing he did get !@#$ for was if he did not undercoat. Every single new Ford was supposed to be undercoated, at least this area.
I've heard all kinds of stories, like a deceased rail hopper in a brand new Lincoln, this car was removed from the train by crane and promptly crushed.
How about a 70 Galaxie with Fuel Injection, and the whole company was constantly crowding around this car checking out the 'Funny' Intake System. a Ford Exec showed up within the week wondering how it made it all the way out here, and he took it back. Some of you might realize what was supposed to happen with that car.
They also kept hiding a 428SCJ-4 Speed Torino around the back of the lot for about a week burning those Original Polyglas off the back, until the dealer himself showed up mad as everything wondering where that 'Special Order Torino' was.
Andrew