It no longer exists which is all that's necessary.
The "anonymity" of such things is merely a polite convention. If the-powers-that-be have sufficient motivation, they can and will track down the authors of any "interesting" correspondence.
I can't imagine anything more non-sequitur to this context. Your paranoia is amusing.
My "paranoia" is the result of my professional experience.
Have fun on your bus ride. Infiltration of an enemy camp is often an educational experience if one keeps a very low profile. Send me a post card afterwards.
Stay safe!