Missing files from ALPHA4 memstick.img

I just downloaded the FreeBSD-ALPHA4 memstick.img file.

I have a custom install script that worked on ALPHA1.
Nut now it does not work anymore.

I noticed that i missed some files on the memstick image (if i am not 
mistaken.)

I do this in my script:

echo ""
echo "# Install FreeBSD OS. (base.txz kernel.txz doc.txz)"
echo "# This will take a few minutes."
cd /usr/freebsd-dist
for file in base.txz kernel.txz doc.txz;
do (cat $file | tar --unlink -xpJf - -C ${mount:-/}); done

But it seems there are no files in /usr/freebsd-dist anymore, except a 
file called MANIFEST

Am i missing something?