I was never zoche to see him. However, my father in law was very close to him. When my wife and I were going through fertility treatments, my father in law asked him for a bracha for us. Instead of the usual “bracha v’hatzlacha” he gave, he pulled my father in law over and started asking him details about our case. He then advised him on what treatments we should do.
Last night, my brother in law sent us pictures of R’ Elyashiv from his wedding. I don’t know if he was the mesader kiddushin. The pictures are from the kabalas panim, and you can see R’ Elyashiv reading over the kesuba, then discussing something in it with my father in law.