Thanks for that info, it is really helpful. I have a couple of issues with all this! One, no budget to store in the US until everything gets settled months after I move, and 2) No one to trust left in the USA to attend to the storage unit and/or management of getting stuff to the shippers. Yes, all of the shipping companies I "interviewed" did mention the baggage certificate, but not one of them said it was a document that I had to fill out and send to the Consulate. It appeared as though it was just another document to go with the whole set of paperwork needed in any case, to ship stuff and it appeared it was something they did.
I started looking hard at shipping luggage companies over the weekend to see if that was a better way to send some of the smaller things. But then again, a few boxes here and there will not make much difference in cost for a larger shipment with a few pieces of furniture from a shipping company. 5 small boxes at about 20 pounds each would be about $700. That seems like a lot when those same 5 boxes in a larger "shipping company shipment" wouldn't make any difference in costs.
In reading expat blogs and online journals, one thing I have seen consistently is that people are sorry they didn't take more things with them in certain categories - like tools, "knock around the house to do repairs" old clothes, books in English, art supplies if you are creatively inclined, etc. I see some people mention spices and items like that, too. In reading the importation rules, it seems as though food stuffs are not allowed.
Anyway, there are a lot of moving parts to consider!