They did, and a quick Facebook search revealed the writer of the message immediately.
"I couldn't believe how easy it was after all these years. Of course, there was no Facebook back then. But I put in her name and there she was, Maria Gibney."
Now 27, Maria, who lives in Tahunanui, vaguely remembers writing the note and says she was stunned when Cheryl sent her a private message via Facebook. "I was like 'whaaaaat?' This is crazy."
She laughed at the note her ten-year-old self wrote, "I don't know why I thought it was a good idea to describe myself, obviously that was important to me."
The three quickly arranged to meet up and Maria says it was emotional. "My grandparents had a house over there so I spent a lot of my summers over there. This is really special to me, I had a great childhood and it brought up a lot of memories.
"When my grandfather passed away, my grandmother moved to Nelson. I think it was probably one of the last times that we were there."
Cheryl and Sharon say they were just happy to have solved the mystery of the message.
"We've been walking together once a week for 20 years and I'm always fossicking. Sharon always tells me off and I remember the day we found the bottle I was picking up some rope and a bit of net and Sharon told me off. It was when I was there getting the rope that I saw the bottle and that it had a letter inside it. It would have been hard to see because it was the same colour as the rocks."
Cheryl told Sharon she could see a note in it and they tried to read it then and there, but were distracted by some young men in an inflatable raft getting into trouble.
"We helped them get ashore and then took one of them to Richmond, so forgot about the bottle for a bit. After we read it we looked for this little pink house in Pakawau, but we could never find it."
Sharon says they both went over a couple of times to look for the house but eventually packed the message away and, over time, forgot about it.
"It's always been in the back of our minds, we thought 'we have to find this girl'," says Cheryl.
"It's amazing, really, that Maria is still in Nelson and still has the same surname. It's such a great ending to the story."
Maria says she's going to frame the note, alongside a photo of her grandparents' bach.
- Nelson Weekly