I don't think the likelihood of it getting lost is very high, but I think the likliehood of AADSAS being completely and utterly incompetent is pretty high. I thought "no way would I be the one to not have my transcripts make it there/get updated" because nothing I have ever sent in the mail has gotten "lost" and of course it happened to me. Waited 3 weeks for the first set--nothing; sent them again and AADSAS updated "received" within 3 days.