A horrible thought but was Garth so scared of the threats he'd received that, in a drunken stupor, he took Chloe somewhere to hide her or even more sinister, gave her to the people who threatened him. A case of "Here, take Chloe. Look after her and I promise I'll have the money to you by......"
Yes, I know it sounds ridiculous but so is this whole mess. :banghead:
I do feel that the threats Garth received had to do with one or more of his children being harmed. IMO, that would be the only reason he would report the threats to police. I don't think he would have gone to the police if the threats were aimed at him personally.