Can a house be both move in ready and in need of a CO?

Sure, completely possible. All not having CO yet means is that the current owner has not paid the fees & applied for one. Every house does not say that because most people get the CO before selling. The seller of that house is just being lazy.

That certificate tells a very important story. There is no doubt that the city has

found many problems that prohibit anyone from living in the house until such

problems are rectified and inspected, before an "Occupancy Certificate" can be

issued. These things would not show in pictures. They may not show in a walk

through either.

You would have to investigate. I would be very suspicious; perhaps the seller did some work subject to inspections, without pulling permits. You don't want to be on the hook for fixing that.

"Buyer responsible for CO" sounds like the seller is hiding something.

that just means you have to get it from your local building inspector.

Usually, the seller does that.

No. . .CO lacking means they have code enforcement issues. Talk to the county code enforcement office about the address listed about the deficiencies.

That just means you have to get it from your local building inspector.

Usually, the seller does that.

yes, it just hasn't been inspected