The redmarked ones are among the 400, but the last 5 of the 15 are among the 365 last glyphs on side b. But we had better take a closer look if there really are 365 glyphs beyond those 400. Both Barthel and Fischer indicate that there seems to be one destroyed glyph at the end of the text, but I have counted with 2.

If there is only 1 missing glyph at the end of side b the suggested last calendar cycle could be 364 days long instead of 365 days. But then the total number of glyphs cannot be 1296. We need an extra page to consider the alternatives.