Reply To: 10B

Case file 10.2

Well that is no help at at all, I would guess everyone has already got that!
Symbol Frequencies
\ (7056), / (7056), | (7056)

My thoughts
Yes each has the same amount of occurrences, spacing cannot be rearranged to give 6 or even 5 needle code.
We are dealing with just 3 values, so this is nothing to do with Wheatstones needle code, it was just used to send the message as is given.
I think the symbols must be substituted placeholders it looks more promising using 1,2,3 and then regrouping to make numbers, but then what?
I have tried Morse code in all forms to no avail (staying within time date 1800’s of what ciphers were available back then)