It's proving to be difficult. The letters I sent have already reached the post office, but they claim they were lost. They haven't even started investigating, and now two of my letters are missing.
Then there was the most difficult one to handle – I went home in late May and found a letter in my inbox. It had stamps from Anhui, Wuhu, dated March 14th and 18th, and it arrived at my place in May. 😂