If I have back taxes I need to file but I don’t have my w-2s for those years because someone stole my identity, should I file this years now or do an extension?

Someone stole my identity and my w-2s got sent to them should I wait to file and do an extension for this year until I’ve gotten those documents (even the irs isn’t giving me all my info) or should I file this years and then do my back taxes? I don’t owe anything I just don’t know what to do and the irs numbers haven’t gotten me anywhere