My brother left his personal belongings on the ferry.... is it posible that he can get it back? Do they see the camaras to find out?

Its NY so has a better chance of winning the powerball.

Not sure if they have CCTVs but you can report the lost item via their website (search 'Staten Island Ferry lost and found' to find the website). You will be asked to fill in a 4-step form on the website.

Call lost and found