1) One transcript from each college/university you attended needs to be sent to AMCAS (even if it was summer school at a JC). The individual schools won't ask you for a transcript until you've been accepted and plan to matriculate there.
2) Some were electronic and some were not (I had to mail Georgetown, George Washington, Drexel, and SLU, I believe, and some others). Maybe you can have someone check your mailbox once a week?