Fortunately, there's some famous ones nearby, a true Adelaide
Landmark.
Micro tin containing logbook and pencil. Room for tiny swaps
only! Difficulty is purely due to the muggle factor - be very
careful to avoid suspicion!
First few people can join the campaign for existential negation
with some nice warning labels.
Sat lock isn't great, but if you've found "Man
of Steel" before, you'll have no problems.
If not, it might be best to phone a friend. Sounds like any one
will do...