H1B renewal Drop box facility - I 797

Hello there,

My H1B visa stamping expired on Feb/2014 without travelling to the US.I think I'm eligible to go for a drop box facility as per ustraveldocs website. Should I have a new I 797 before I go for Drop Box?.If no , will the visa issuing authority will send a new I 797 once the visa renewal done?



Regards,



Magesh