There were several cars left over. Many wrecked, some okay. A few ended up in other movies and some made it out to the public. I know several were auctioned to one guy that broke his lot up. There were also 2 different builders for these cars. There are differences between the 2 if you are looking at them in person.
The duck ornament is available, but is only one part of what you need. They also made a pedestal for it to sit on as the Charger hood had a peaked body line where this sat. They casted one style base with a rough V notch and custom ground each base to fit each car as every Charger was a little different (most were full of bondo or had extensive body work). We had the very last pedestal they had left sent to us helping a guy restore his Deathproof car that was missing it. We never copied it, but if we had to it would be easy enough to borrow.