After the infringement was discovered and before the settlement, I did have to register the photo with the US copyright office. It was a simple procedure and I think I paid $35. This was done to establish that I did indeed hold the copyright Toyota and friends infringed.
[1] http://en.wikipedia.org/wiki/Statutory_damages_for_copyright...
[2] http://www.ipinbrief.com/whyitsdifficultpredictstatutorydama...