Invisalign relapse 6 months after completing treatment, can I get more trays?

I haven't been wearing my retainer, which I regret. My teeth look crooked and I want to start wearing my aligners again but I threw them away at end of treatment. Can my ortho reorder a few of my last trays although my treatment was completed months ago? I was very happy with my treatment and I don't want to have refinements made, which would mean new type of tooth movement. I would prefer to duplicate the few last trays of my past treatment, which was painless and successful is that possible?