I called AMCAS in March and asked this same question. They told me that yes, you need to use the transcript forms or there will be a possibility that your transcripts can get lost in the shuffle. I was also told to use the forms that were available online at the time for the 2001 entering class (even though I was applying for 2002). I called last week and my transcripts had been received. You would probably be wise to do the same thing.