Hi, a post has gone up on a local neighbourhood site about rehoming a cat. The person trying to rehome is local to me, and says it's because her young child has an allergy. I spoke to her on the phone and am going there over the weekend meet the cats. They're adult and she says they've been microchipped and neutered, and she's not asking any money for them. Any red flags I should look out for or things I need to check? What paperwork ought to be in place?