That will work if whomever created the job put in a description. A job can be created without one.
There's no direct way to decrypt the DTSRUN parameters, but try this:
1.Run the package, either by starting the job or copying the DTSRUN line to a command prompt.
2.Then run this in QA:
select top 10 *
from msdb.dbo.sysdtspackagelog
order by endtime desc
You'll see the most recently run packages.
I've also read about a decrpytion routine called DecDTSRun but I haven't tried it. It can be downloaded here: http://www.sqlsecurity.com/DesktopDefault.aspx?tabid=26
Greg
Greg