I'm confused

What does the IOE receipts stand for?

– 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.

OP, that's completely normal. Even I had the IOE number. Just keep track of your case through ELIS.