The green messages mean I have been blocked prior to sending those final messages.
Their goal (and every scammer’s goal) is to get you to send money digitally prior to meeting. They will also use a fake number generator which is why you can’t call this number. I tried as well and it just won’t go through. Their number may change if you see their listing again because they can just pay or select a new one.
Chat on Craigslist with me should you have any questions. NEVER send money prior to seeing the animal!