Awesome work! These should be all of the double issues from issues 401-737 (via here);
401/402 412/413 421/422 438/439 453/454 464/465 473/474 490/491 505/506 525/526 542/543 557/558 577/578 595/596 609/610 629/630 647/648 662/663 682/683 699/700 714/715 734/735
This is the only issue that I have which hasn't been confirmed in the first post;
I have a request, Famitsu used to publish annual and semi-annual hardware shipment reports in the Famitsu Express section. We've collated the figures here, along with scans of the reports from years 1992/1993 (#231), 1993/1994 (#287), 1994/1995 (#339), and 1995/1996 (#392). We're missing the report from 1996/1997 ... I think that it should be in the issue with the cover date "１９９７年０６月０６日号". Does anybody have this issue, I've been keeping an eye on Yahoo auctions for this issue for ages. We don't have the report from 1997/1998 either, but I'm not sure what issue that is from, but it should be one with a cover date from May or June 1998. I don't know whether they published these prior to 1993 or not.
We could also do with scans from the semi-annual reports, but I only know of two issues which contain these; #221 (first half 1992/1993), and cover date "１９９７年１２月２６日号" (first half 1997/1998). There are probably others, but I don't know which issues.