Dear Kurt, thank you very much for your patience and persistence!
I am specially put here the both envelopes with my address.
A small one was received at my post office on January 24, 2018, but it never reached me and returned to the sender. Postal servants explained this by the fact that instead of the address 18-1-15, it was read 18-A-15 or 18-4-15, and it was me who was not found there.
Kurt, I beg your pardon for the work of the russian post.
Thank you very much for the repeated sending!
Natalia