I got threatened that if this ever happened again, they would send me to secondary (at best), as they would not believe anything I said about my trip if I wasn't going anywhere.
But he spent many words on saying this!
It still makes no sense to me that APIS and ESTA are both ok without a specific address, yet immigration (on the customs form) is not :-(
And apologies for the slow reply - I was enjoying the no wifi/3g area of a couple of your national parks :-)
DanishFlyer