$50 · Lost gopro (black with headstraps with family videos)

Lost gopro(black, with head/helmet strap attached) Biking with my 3 and 5 year old and we have been videoing family outings. Have a video of my 6 year old when she rode her bike without training wheels for the first time on there. We're all very upset to lose this. It must have fallen off or strap broke off the helmet. It was more than likely in front of two locked bikes at the top of stairs, but may have been on beach. Sunday September 4th between 2 and 330. Please let me know if anyone has any info. Would truly appreciate any help in bringing it home. Thanks for everyone's time and help