Can a repo man or lienholder report car as stolen if he locate it in Nevada?

No, a repo man or lienholder cannot legally report a car as stolen if they locate it in Nevada (or anywhere else) after repossessing it. Reporting a legally repossessed vehicle as stolen is a crime, namely filing a false police report.

The repossession process, while often unpleasant, is governed by specific laws. If the lienholder followed the proper legal procedures for repossession, then the vehicle is rightfully in their possession. Reporting it as stolen would be misrepresenting the situation to law enforcement.