No Letters from the Rebbe
I once asked my father why he didn't have any letters from the Rebbe. He replied "What do you mean? If you have a question you just call the Rebbe's secretary and they get back to you with an answer."
I'll add the epilogue that my father did the same after gimmel tamuz he called the Ohel to get a bracha for someone or submit a message to the Rebbe and the person there always knew my father's name. I'm not sure who he is but he has a distinct voice. And I've since put the pieces together that my father was doing what he had always done before gimmel tamuz. While he did go to the Ohel as well as he did for dollars that was more rare and he mostly called the secretaries over the years.