Seemingly innocuous or unnecessary information can work well as a confirmation code. If every legitimate letter includes that phrase, and a letter is found that does not, it indicates that it is either a forgery or written under duress. (The meta-reason is that it helps the reader know that this is a regular spy transaction. but it is fun to be able to help explain it in-character!)
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Why would you need to state on the letter that you are hiding said letter in the usual spot?
Seemingly innocuous or unnecessary information can work well as a confirmation code. If every legitimate letter includes that phrase, and a letter is found that does not, it indicates that it is either a forgery or written under duress. (The meta-reason is that it helps the reader know that this is a regular spy transaction. but it is fun to be able to help explain it in-character!)
Or if THIS letter would show up in unexpected context.