I have to use freight forwarders too and Amazon adding the extra numbers at the the end of a zip code has never been an issue. Once you have the correct street address along with the zip code, your stuff should arrive where it is supposed to. For more info check this link…
I bought some hardwares from Amazon US this weekend, it will be sent to a freight forwarder then to where i live. But i think i might have run in some problems. When i add the zip code for the first time, amazon add +4 at the end. (31666-2774), that's alright. I got one order shipped to this address. But after that i had…