answer to your question
My case:
VSC transfered case to NYC by mistake. After requests, file was transfered from NYC to Buffalo. Between the date the file actually arrived in Buffalo and the time they issued me a receipt took one month.
After four months from effective transfer date, and three months after issue of receipt date, I did not get any interview date. The name security check is the probable cause.
On the receipt, they tell you not to call within 9 months after receiving the receipt notice. Some people claim an interview date 4 months after transfer. God knows...
IBIS check only lasts 5-10 minutes (I've seen it performed). Name security check , however, lasts, according to previously posted messages, maximum 120 days. You'll be able to get AP within two weeks, if applying in person.
Good luck and let me know if and when you get interview date. I hope this helps.