If insco suspects fraud, they will disclaim. Much will depend on when you made a report (to LE) and what was included in that report. If one lends a registered/insured vehicle to another that person is a "permissive user" and insco must pay. If the person was NOT a permissive user, the taking can be either 'unauthorized use' or 'theft' ... two different crimes, which one depends on when/where and other facts.
If you left keys in the ignition and it was taken and you did not immediately report to LE/insco, likely that person will be treated as permissive user even if you did not give explicit permission (act of leaving keys tantamount to giving permission).
If one can imagine the various ways insco may be defrauded, betting that half or more of them are inside-jobs and 'takings' by 'permissive users'. Its no wonder they crack down and refuse to pay for your 'loss' ... Their argument: you caused or contributed to the loss and therefore they should not pay?
http://www.auto-insurance-claim-advi...ermission.html
19Trees