Very interesting point. Few might realize that keeping bills or tax notices around is effectively to maintain a court of record (i.e. the records you keep). To pay taxes you owe might be to collect tax on yourself or your person and participate in the U.S. Tax Court or whatever tax court it might be. Perhaps carrying around ID is a kind of 'mobile record keeping'. Maybe even State ID itself is a kind of record?
Related:
Be Your Own Recorder?