End did the same to me, used pre-code price on customs form. I emailed End to have it changed, but they said they legally need forms to "match our invoice totals held here with the company. We apologise that we cannot help any further with this issue." I emailed FedEx the End invoice with post-code price to see if they would change, never heard back. Picked up package today at FedEx office--no customs paid. But I had to fill out a US Treasury 5106 customs form with SS# (I think that is what your FedEx agent was referring to), so I am expecting the bill. And from what I hear, I expect it to be high: FedEx charges a brokerage fee?