Tablet Y has now finally received Barthel codes. The codes have also been added to the XML corpus, so searches should return hits for tablet Y among its results.
Though there are no genuinely new glyphs, I did in fact use one code that was never used in Barthel’s original corpus. Apparently glyph code 250 had never been used:

Pages for items X and Y have been added. These svgs were created from Fischer’s drawings. Also a page for svg test pages for all of Fischer’s drawings has been added. While all the pages exist, the svgs themselves still need to be added. They will be added from the end. So far Y – T have been added.