Xbox 360 kiosk downloads ... alternate method?

[GM80]

I finally picked up an Xbox 360 Memory Unit and spent this afternoon making the rounds to several stores, sticking it in their kiosk and downloading whatever content they had available. I came away with a few Ridge Racer 6 cars, four Dead Rising costume keys, and a couple of Dashboard themes.

It seems that in the past, there have been other more exclusive downloads which I have missed, such as store-themed Burnout Revenge cars at specific retailers. The kiosk discs that housed these downloads are long gone. Is there any alternate source of downloading these files?

They're not DRM'd in any way and were given away free in the first place, so I have no qualms about finding a web-based download for them which I could transfer to my Memory Unit with one of those USB adapter thingies ... but I can't find these files anywhere.

I'm specifically looking for the Burnout cars, but there may be plenty of other stuff out there I just don't know about. Any help?

[Slate]

You'd have to find someone who has been downloading the files, Then have that person copy them to a computer and then have the files emailed to you.