There was never an AMBER Alert issued. It didn't meet the criteria. 31 days had elapsed since Caylee had gone "missing". There was never an accurate description of who took Caylee, where she was taken from, where they may be headed or when she was actually taken.
Remember, first she was said to have gone missing on 6/9, then LE found a video and still pictures dated 6/15.
Nothing KC said about Zani could be substantiated, no address, no phone, no relatives, job, roommates, nothing. If LE issued AMBER Alerts with the type of information given by KC, instead of OCSD being on the lookout for a nonexistent person; every cop in every state would be looking for a person who doesn't exist.
What happens the next time a child goes missing? All those people who looked the last time say, "Maybe this one isn't really missing either." LE has to be really careful about never letting AMBER turn into the boy who cried wolf situation. Every missing kid depends on it.