Several months back I lost my driver's license while on a trip. To this day, no idea where it went. I didn't have my passport with me, but I did have my Texas concealed handgun license. It's a government-issued photo ID, but I called the Ft. Worth FSDO to verify before flying back and got affirmatives from two different inspectors, one of whom was nice enough to fax over something in writing that they had spoken to me.
The woman I spoke to who faxed the paper over said that I shouldn't have any problems with it (which fortunately I didn't) since it's government issue, has a current picture, and - in her words - "looks official".
Of course, we all know how wonderfully aligned all the FSDOs are in their views...