You shouldn't be thanking these guys, they have just set you on a path which will destroy your wallet, yahoo Japan is the devil. It may start at a Dreamcast but next thing you know you'll be buying CPS3 boards, TTX3s and lord knows what else. Just look at @mR_CaESaR with his 1000's of tokens
You might (probably will) get charged. It's happened to me when using a proxy to forward for a PCB before.
Anything under $1,000 AUD it's up to the proxy to collect. Anything over that, then Border Force who send you an invoice, which will include clearance fees, etc. on top of the GST. It's fairly costly.