I received the confirmation that they accepted my application and I have the same IOE case number. @Rajsekar I sent the $6.25 priority mail. Also see below as it explains the IOE code hope this helps:

– EAC – Vermont Service Center;
– VSC – Vermont Service Center;
– WAC – California Service Center;
– CSC – California Service Center;
– LIN – Nebraska Service Center;
– NSC – Nebraska Service Center;
– SRC – Texas Service Center;
– TSC – Texas Service Center;
– MSC – National Benefits Center;
– NBC – National Benefits Center;
– IOE – ELIS (e-Filing); and
– YSC – Potomac Service Center.