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Ginza, so make sure you buy something
This is very obvious once you've found it. To prove it, tell me what she's sitting on. And would you be tempted to put anything in the slot with so little information about the owner? Nearby are the Nissan showroom (bonus marks for working out how they get the cars in and out), the Waco building and the Tokyo headquarters of the Sapporo brewery. The hardest part of this cache is not getting swept away by the crowds as you mess with your GPS!
Update: some emailers don't give me an email address to reply to. You may not get a response, since the site doesn't work on the phone I receive the emails on.
(No hints available.)