Unlocking NASTA dial post locks

"I can't open the post lock"

Has the number of the post lock changed for some reason? The site was a tenant company in an old building in Tokyo.

The company seems to be on the third floor, but the mailbox was at the entrance on the first floor.When I tried turning it, I was like, "Oh, it's open."I unlocked it immediately.

After that, I went up to the 3rd floor and presented the quote to the requester and got his approval.Since the work had already been completed, I operated again for confirmation.

Nasta post locks have two dummy "DD" positions.Once you know this, you can easily find the number later.

After all, the client didn't know how to use this post lock, and apparently he always left it open, but it seems that someone turned the dial.