Why is that even a concern to you? Read on...
If you are thinking of changing the report in any way for any reason, don\'t do it. That would be fraud. If your question was really born out of curiosity, then, no, the sealed envelope is the only communication between the Doctor and INS.
Just go to the doctor again and explain what you did and get them to put it into another envelope and re-seal it. The contents are not confidential to you. They can easily give you a copy of the report. The sealed envelope is a must to ensure that there is no tampering of the report. Do not send the envelope the way it is and do not try to re-seal it yourself. As it is the GC process is harrowing. You do not want to invite any more complications.