Squeak!
The Feds labour mightily and bring forth a mouse. I mean, all that effort for a fine that even a poor IT drone could pay off. An application of Hanlon's Razor is appropriate here: no malice, just incompetence. We might note that such incompetence is rife in areas like Health Insurance (forever asking for copies of patient records that they then lose) but no Federal wrath descends there.
As an ex-PR myself, now naturalized, I never had any problem showing my green card. Here it is, now bugger off. BTW it wasn't green.