Is Concealment a Crime in New York

Is it a crime to conceal an item in your pocket in NY? I never approached an exit

yeah because that's a form of theft.

In most states - yes. It shows you had INTENT to STEAL the item. And in most cases, you broke open the packaging to put the item in your pocket.

Oh...your hands were full. We've heard that excuse. That is why most people go up front and place the merch into a thing called a Shopping Cart.