Original I797 returned after a year with new 221g

I attended visa interview on April 2016 and the counselor issued me a 221g stating it requires further ‘Administrative Processing’, NO additional documents were requested. Now, after a year, the consulate had returned all my original documents (including Org. I797B) submitted during the visa interview along with a new 221(g) slip (same case no. though) stating it requires further admin processing.

Is there any hope for my petition? What are the chances of my visa getting approved ?Under what circumstances normally the consulate returns the original documents?