After you first submit your AMCAS and become active schools will download your name, address, and email info. Some schools use that to send out secondaries, enter your info in a database, etc. before they receive your verified AMCAS.
After you're file is verified, schools will download the entire file complete with transcript, essays, etc. When a school does this, the date is listed on your application in the right column when you choose the "Print Application" option.
-Swamp