I was lucky enough to win a rank 3 prize on my character "Slayte"

Because I spent so much time deciding what prize to pick, I traded the prize marble to the Moogle on last day, but still with several hours to go.

I still spent a good amount of time with the prize window open, still deciding between Kupon AW-Om and Mog Kupon W-Pulse.

After consulting with others, I logged in, using my laptop, forgetting that I still had the trade window open on my home computer.

When I logged in, still with plenty of time in the event, to discover that I had lost the marble.

I was told my a GM that because I hadn't dropped it, but lost it because the NPC didn't return it to me, they couldn't recover it.

Is there anything that can be done?

Thanks