NUS admin didn't let me collect Garry's transcripts with an informal authorisation letter written by Garry.
So Garry sent me another:
Dear Registrar's Office,
I, Huang Zhiwei, Garry, NRIC No. S8123456Z, Matriculation No. U027898N, Hp No. +1 650 777 3777, Date-of-Birth 31 February 1981 4:31am, hereby authorise LEE WENG HONG, S8123456Z, Matriculation No. U027890W, Cellular No. +65 6777 3777, Date-of-Birth 08 July 1921 7:32pm, to collect my official transcript from the official Registrar's Office of the world class university known as National University of Singapore.