Sadly, these files do not exist any more.  Seems a little odd since I had to boot somehow from the ISO.
 
root@box:/# find / | grep grub
root@box:/# df .
Filesystem         1K-blocks    Used Available Use%  Mounted on
tmpfs                   229508  17408 212100    8%  /
Any clues.
Not odd at all. A look at the CD or mounted .iso would show that isolinux is used as bootloader.
In the same way you say "sadly", I could say "fortunately" as I'd prefer different bootloaders and have never had a need for grub with TC. 
I'd guess it's more a matter of free choice of user not to include a specific bootloader in base, when there is a choice between several Linux bootloaders to achieve the same goal.