Here is a low tech way.  Run ildasm from the command line to make a listing
file, something like

    ildasm xxx.exe /out=xxx.txt /source /nobar

File xxx.txt can be searched for " box " and " unbox " from notepad or
whatever.  Be advised that running ildasm this way will make some resource
files that you might want to delete.  I think this can also be done from the
ildasm gui, but I have not tried it.