It my experience, it kinds of depends on how many of the items they want at particular warehouses, so there's no real good predictor when doing Multiple Skus.
Completed the Disney Castle. One of those sets that I waited too long to purchase but was able to acquire with some help from a new friend. Enjoyed the build with the subtle touches to movies, characters from long ago.
Still beats what I would make selling them on ebay. These are mostly one off returns or sets that fell between the cracks over the years that I occasionally round up when they accumulate and ship them all off together.
In any case amazon didnt like me complaining so now all shipments are down for me