We would get 1 with a remaining + This doesn’t add up
What I meant was to try and apply the caesar cipher on the numbers:
5268 (with -+-+ pattern) is 4359 and if the numbers represent letters from the alphabet we would get "D C E I" ,which could be an acronym in German or a different language. Also if you take the +-+- pattern you get the word "cigaretteG"
Just my speculation, got no proof that the numbers represent letters.