Hey guri,
Same situation is in Dhaka, Bangladesh.. So many students are waiting for completing their administrative processing though their I-20 reporting date has passed. Embassy communicated with them telling to collect extension letter from university which will prove that joining lately will not hamper their position in university and that letter have to show at PoE in US. So, I think if you can arrange new I-20, that is better but if you can get extension letter at least that will also do.
Regards