It sounds like a bugga of a time to get things shipped...
I dont know how different it is from the US but I see a fella getting a boat from the same factory in China where I got my boat has paid more then double what I was quoted last year when I got a container in..apart from delays they also quoted him $2900 US and then once shipped emailed to say they couldnt get it on that boat and had too put it on a more expensive boat at $3500 US..
This same thing was tried on me and a half dozen other guys that I am aware of ...missed that boat, more expensive time of year etc....only one silly guy paid the extra...the rest including myself said they were only paying the original quoted price...
Apparently there is also now a surcharge by some shipping lines up to $350US ..
I'm not sure about the wharf and unloading costs now but you need to get quotes off a few companies as the costs there can vary wildly and it also depends on how far you want to haul the container and have it picked up once done with it.......just google import brokers/customs clearance etc and shoot them all a email detailing what you want done and pick the one that best suits....its possible to do it all yourself but if you mess up and flag yourself for a customs inspection then its more time and money...so I had a broker fill out the customs forms and clear it and then I arranged the pickup back to a nearby yard in the port precinct that had equipment to unload and an area for me to build a trailer and load the boat on....