I had a small number of books (30?) transferred day 1, a bunch more (770?) around the end of the year, and the last ones (50?) in early Feb.
Since day 1, I sent many (20+) customer support requests to B&N, F-Wise, & Ereader and made multiple calls to support. but I think the calls to cust support broke the logjam for the last few books... my last support call was with someone who seemed to know a bit about the process and could respond with useful info.
See some details in a back post here:
https://www.mobileread.com/forums/sho...&postcount=629
Greg in Mississippi