回複：Is the check payable to the department of howeland security?

that guy wrote:
Note: AP checks were favoured to “US Department of Homeland Security, EAD checks were favoured to “Immigration and Naturalization Service” and write the “A” number in the memo section.

I read somewhere on the same forum, checks to
USCIS, DHS, INS, are cashed without problem.

I only did one E*file before getting my GC. I think E*file is easiest. I didn't mail any supporting document - nothing at all. Payment is also easier: use the reward credit card to pay less and about one months later, without having to know the exact name of the payee. The only problem with E*file is having to undergo a fingerprint appointme (not a problem for me, as ASC is in my backyard).

good luck.