LOST Giro aeon helmet at ourimbah Sunday 5 Jan

My name is David Paviell. I was at the Ourimbah MTB XC tracks on Sunday 5 Jan. I left my helmet on the car roof at 12pm and when I went back to see if it was there I was told that It was picked up by 2 guys in a grey hatchback. I'm not sure what happened to it from there but I was also told that some people saw it on a sign near the tree tops adventure park. I asked at Tree Tops and they had not seen it.
It is a blue and white team Garmin Grio Aeon helmet. It had a distinctive New Zealand sticker on the right side.
If someone contacts you re the lost helmet can you please let me know. Also, are there any lost and found forums that I could put a message on.

Thanks for your help, David Paviell.