The errata page gives us a hint for this puzzle: take the
numbers, convert to 7 letters, convert to 7 numbers.
The title clearly refers to Roman numerals, so presumably that is
the first conversion:
100=C 50=L 5=V 10=X 500=D 50=L 500=D
Then what do we do with CLVXDLD? We convert it based on telephone
code, to get 2589353.
This is an MIT phone number, and when teams called it, they got
sent to an Athena cluster. When teams got there, they got a phone
call from headquarters telling them to be at another cluster
within a time limit. This was repeated with several other clusters
with progressively shorter time limits, with the call in the last
one telling the team they could find the answer on a bulletin
board in the room.
This puzzle is in course 6, EE-CS, because it was an Athena
cluster runaround. Thanks to Thomas Mack for providing the
information about this puzzle.