@Zoofan15
Actually something I do remember from mid 1994 first visit is (now know that had to be) Nella resting her big beautiful face on the ledge of the land portion of their exhibit while the other Elephant Seal (now know that had to of been Macquarie) never stopped swimming while was viewing. I remember at first being taken aback that the face of the Elephant Seal resting on the edge of land area (nki Nella) did not have the same face had seen in the pictured animal book had read, wish the book had shown a picture of a female Sth Elephant Seal also, to highlight the diversity of gender variation in thei species, as Nella was equally as striking imo, was 5 at the time but did assume was seeing a female and filled in the gaps myself about the aesthetic difference. With the mid-late 1995 memory though have a clear memory of looking at both Sth Elephant Seals as they swam close to the public viewing barrier side looking down into their pool (in hindsight so impressed remembering how 'showy' they were), whats interesting is now I think perhaps Macquarie had been moved to the pool just to the left/west of Ellie & Nella (the one designated for Leopard Seals from the beginning of the 'Macquarie Island' plan) but perhaps my family and friend who remember being with us might of decided to rush past the first pool (we came from the west direction past Raya & Shar the Sun Bears exhibit from memory) so perhaps that's why don't have any clear memory of Macquarie's impressive budding snout, because for whatever reason we didn't stop at that first exhibit..or perhaps we did stop fleetingly but perhaps Macquarie was resting on the land portion of his exhibit..but at an angle that didnt show his face to the public and just did not commit it to memory..but Ellie & Nella put on a very memorable swimming show (remember even back then wishing there were way more underwater viewing areas for more of the pools, especially for the Elephant Seals at the time..but credit where credit is very due, Taronga saw to that a little over a decade later with the Great Southern Oceans complex construction).
The sexual dimorphism in Elephant species is indeed very pronounced. Assuming Macquarie was at least a year old upon capture in late 1988, he would have been approaching seven years old when you saw him in mid 1994. His proboscis wouldn’t have been fully developed, but would have been distinguishable from the female. Completely understandable if you have little recollection of this given your age however!
I remember as a child being surprised by a photo of an intact male California sea lion. I’d seen the castrated male (Scuttle) at Auckland Zoo and therefore assumed males of this species looked like large females. It was interesting to come across this fridge magnet of his sire:

Souvenir Fridge Magnets