Thanks, Pretzel! I haven't done a binary file comparison yet, but it looks like the README.txt file matches that for the freely-distributed "f15303.zip" patch. There are some extra README and .bat files that don't provide anything extra (just some instructions that are specific to having the files on a floppy instead of in a .zip file); I have also seen those same files on two identical floppies that came with a copy of F-15 III I purchased from eBay. Those two floppies had labels which had the MicroProse logo printed on them but had something like "F15 2" written on them - I assume that back in the day you could write to MicroProse to get the patch posted out to you?
Eventually I will document this in my "Reference Manual" and put the freely-distributable "f15303.zip" online somewhere permanent. If anyone has trouble with Pretzel's link due to all 10 downloads being used up, let me know and I can hurry up about it

Thanks again Pretzel, it is nice to have that mystery solved at last!
Regards,
David