I agree with Doug, let him stay in the carrier and let him choose when and where to come out. It could take a long time, but I think his comfort level is very important and it will help his level of trust grow. A long time ago I read? heard? that greys often don't like big cages, feeling more comfortable in a smaller one, but I figured it was most likely the ones that were kept in small cages from the beginning. ??
Kim