I have recent experience organising a Carnet. I arranged for 8 riders, self included to ride/race Sepang circuit last December, 2016. I purchased the Carnet from the Victorian Chamber of Commerce for $425 I think. What followed was a little tedious and the lady I was dealing with was a bit radical.
We itemised, labelled and valued all we were shipping. The lady initially wanted everything noted, every screw driver, ring spanner, nut, bolt and stubby cooler. Toward the end, tool box, red, with assorted tools did the trick. Vin numbers, make , model, year of the bikes were important as they were the money items. When the literally dozens of pages were submitted, there was a total value. Our was $100,00 or so. At this point there were several options as the Carnet requires a surety, it can be a cash sum, a bank guarantee or a one off surety payment based on the declared value. The later suited us. It was something like 1.25% of the value, which came out to just under $1200 in total.
Once the Carnet was paid for, it was sent to me. It contained in our case, 4 pages, export/ import for Australia and the other 2, in and out of Malaysia.
I had Oz customs sign there bit and the remainder of the Carnet was sent by courier to our shipping agent in KL. And that was largely the last we saw of it until the bikes got back home 3 months later.
I got customs to sign off the reimport into Australia and I then surrendered the documents back to the Vic Chamber. The last bit is very important.
I look like doing it again later next year for another visit to Sepang. And it will be a lot easier I'm sure.
Cheers Wazza