Lucky you, Amish-geek! To review what you know:
The email virus is forging your address as the reply-to, and you're getting the bounced messages. So you want to get the headers from the message that bounced, to know whose infected computer is sending it.
If the server bouncing the message is chopping this out, I don't know how to do that. Are you checking your email in Windows, presumably with an antivirus? In quarantining the viral payload that may have bounced, it may have chopped away the part of the message you want to see. If you can run linux and check your email with that, it might display the part of the message that shows the original headers of the outgoing viral spam. Good luck!