How can I send money in Japan without leaving an e-trail?

Not a huge sum of money, around 10万. Is it legal to send money through the post here? How about via registered mail?

Edited to add: I want to send money to a friend without her husband finding out. He regularly goes through her payment apps and bank statements with a fine tooth comb. Sending the money via physical mail would be ideal, because he’s usually not at home in the daytime.

Thanks in advance.

3 comments
  1. Asking this question kind of, you know, starts a trail?

    Kids these days, not thinking of bills in pages of a hardcover book sent via media mail.

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