Yeah it is a complicated idea, but yours is it too, because when Neal is Peter Pan. What was his reason to go back to our land? Why he come to our world to be a common thief and not live with the lost boys in Neverland, to hunt Pirates.
Would it not more a Peter Pan to seek adventure on a boat to laugh, tell stories and make a sword fight. He has much in common with Emma and he look so kind, when he spoke about the lost boys.
But of course please do not hesitate try to convince me. I love to speculate and maybe I will change my mind. I know there are lots of hints for Peter Pan. The line in New York which reference to PP and the clues you wrote about his name and lots more, but when you wrote about the wherabouts of Neal in New York. I found a Alice Tea Shop, and since then Neal is the White Rabbit for me.
Maybe I will change my mind. It will depend on the content of the box. Is it a heart, he is the White Rabbit, cause the heart refers to Wonderland, but is it a really angry tinkerbell, who is glowing red, like in the movie of Peter Pan. It could be that I change my mind.
If it is something others who will know. Of course Horowitz & Kitsis.
Heros don't get their Happy Ending!