Maybe I missed something, but if you were 1st kyu when you left why would you need to find your black belt to come back?
Hi Robin, just read your message.
When I quit, I stashed away all my Aikido stuff. 8 years on I can't remember where I put them! I had 3 gi when I stopped, I was only able to find one. I couldn't find my black belt at that time too. I was able to find a white belt while looking for my gi (you get them when you purchase your gi, I think you know that), so instead of waiting to find my black before I restart class, I just decide to wear the white one. I finally found my black belt weeks later but still no sign of the two gi. Purchased a new gi since. The belt had nothing to do with me coming back.