Comment # 5 on bug 1185500 from Timo Jyrinki

Ack, so it seems, I had no idea. This bug could be left with the new subject
line as a wishlist item that the user would be told where to find the installed
sources more easily. Or it could be closed.

When I was a newcomer to SUSE (or well back to SUSE after a very long time) I
had hard time finding them even from /usr/src - even though obvious in
hindsight - let alone now /root/rpmbuild in this case, when I was used to
source fetching commands to fetch them to the current directory. So it's an
usability issue.