i am not a NYC dealer, but it seems to me that you can't ship it without the shell casing...i read this on another forum, that information is here:
my new order can not be shipped no shell casing - NYS and NYC Discussions (licensing/laws) - Long Island Firearms

In case the link does not work, just google shipping gun without shell casing to NYC it is the second link that shows...

Again i could be wrong, but feel free to interpret the law for yourself. i usually use the NRA site for laws..

NRA-ILA | New York