How can I easily verify my diffs are in parent branch?

Hi,

This is not the case of looking through the logs for my commit as I'm
exporting my changes from my tree into the company system through CVS.
This means all the usual commit tracking benefits are lost.

So I have a master branch which tracks this master baseline from CVS and
each release I import a big change set which includes all the fixes that
went into that baseline.

What I need to do is check that my commits that I submitted for the
baseline have been correctly merged. Of course if I do "git-diff
master..mywork" I'll see all the other code that has been added in (or
more usually is missing from my branch).

Is there an invocation of git-diff or another tool that can tell me all
my diffs are present in the big uber-commit of my master branch baseline
release?

-- 
Alex, homepage: http://www.bennee.com/~alex/
Any excuse will serve a tyrant. -- Aesop