Thanks everyone. I guess this is resolved. Final conclusion is that the DOT decided I can keep my license even though I have no history of CPAP usage to show them, but decided I need to send them usage reports every three months for the next year or I get my driver's license revoked. Quite onerous f...

No, I didn't lock the card. Anything that was on the card originally is gone.

Luckily the department of transportation was sympathetic to my case and has given me an extension to collect more data going forward, so I think I'm ok for now.

I use a Resmed S9. The Maryland Department of Transportation wants a usage report for my driver's license (this is a requirement of ALL drivers in the state with any type of license in the state who self-report sleep apnea). I didn't buy the machine with insurance, so no one else has any records of ...