I walked in and the security asked if I had an appointment date I said yes Showed him the paper and he was like " you're early" I said, "I won't be able to come on my assigned date so I called the number and they told me to attempt a walk in", Of course this was a lie I was just attempting to see what' would happen and it worked! He was like " ok have a seat. Lol

Also I know 2 other people who have Successfully done a walk in.