and why would he have given ID to the pigs?

I don’t know what the law is in Pennsylvania, but some states have a law that you must present ID on request if you have it. Nearly all jurisdictions require you to correctly state your name and address to police on request.

And the police here used a ruse that this was all just a McDonald’s loitering complaint. The cop admitted on the stand that the loitering thing was a lie. But that’s okay. Remember: the cops are allowed to lie to you, but you are not allowed to lie to the cops.

Remember also: stating the false name orally is a separate crime from the forged instrument.

So bottom line, the failure to Mirandize could suppress the statements where he confessed to the fake ID and to the fake name. But it’s not going to toss those charges. And it doesn’t suppress the action of handing over the ID, because that’s not a statement.

So there’s a pretty strong case for the ID charge even without the statements.