Way back when, we used to rely on this mode of communication. Then it evolved.
Decipher the code to find the cache, but please be stealthy as the muggles become wary.
777766688844 8447773333 89666
999933777666 33366688777
6666633 7777338887766 664446633
33277778 6666633 6666633 33344488833
33366688777 777744499
334444448 334444448 664446633