After you file

Why would I have to go to the post office? If my mailman didn’t deliver it with the rest of my mail are you saying the post office is like “oh look! it’s so and so’s stimulus check. Let’s F with him more because the IRS didn’t F with him enough. Let’s see how long it takes for him to realize we”re gonna deliberately keep it here at the post office while we deliver all his other mail, except his stimulus check”. (followed by an evil laugh).  Sorry just hard to understand why you’d say that. Fill me in.