I l mean, even without invoking sovereign citizen craziness, it’s pretty easy to imagine a legitimate lawyer arguing the difference between “fake id ” as in an identity document fraudulently attempting to look like a legitimately issued document, and “made up” as in bearing no more than a superficial resemblance to other legitimate identity documents. Now obviously the self confessed train of thought of him deliberately taking the chance to see what the agent would do, definitely comes close to outright mens rea but it’s still arguably not an admission of intent to mislead, and it would all come down to the lawyer… if the agent even cared. Discretion used to be a big part of the “investigation cop” toolkit psychology wise, and fraudulent currency investigation by a secret service agent is much more serious than “this guy shows me his made up id card”