We just received confirmation that we will get to do the Scavi tour this year! We're jazzed about that.
The info we received says to go to the Excavations Office, left of the colonade. Is that the area near the Post Office? Left of the Basilica as you are looking at it from the square?
Thanks for your help! I've looked for a map of Vatican City - but the only one I can find is so small I can't read the print!