Pales in comparison to any above, but if we're just going on card value then it was actually the very first pack of cards I ever opened as a kid, landing a Draft Redemption card in a pack of 93/94 Hoops.
I had no understanding of values at the time and very shortly after traded it to a much older kid for a cool shiny Malone/Gugliota Face 2 Face. Guess he thought he had fleeced me but I still recall his disappointment at turning over the card to find my name and details scribbled on the back. I don't recall even thinking I could send it off and get a bunch of cards back, not sure if you even could from Aus...there was just a line for my info so it had to be done.