Yes, we picked up tickets 1-day early on 10/1.
I had an email several weeks back from ticketing that read this couldn't happen, but it also read as if it could have been confused with the complete MYW DP ticket. Replying to that, we got a phone call saying that we could do an early pick up and provided a reference number.
However we went to guest relations, provided ID and reservation, and got our park tickets. We actually checked in first at Coronado (1-night stay) to get our parking pass. Next morning, checked in at POFQ, and they combined park tickets back to our MYW tickets.
The lady said she worked concierge, but was helping with check-in that morning, and normally check-in cannot do this and would have to handled at her desk or guest relations. She provided print-outs of everything to confirm our credits and park tickets were correct.