There are 5 fake cats you can find in the Thomasina House plus the real cat statue. This quest is given to you by Lionel Castershire in Maidenholm after you brought him the three records. The Thomasina House is located in the St. George’s Holm and has to be approached stealthy. The house is populated with a tee party of granny’s that will scream for the police when they spot you.
Be careful since there seems to be a lot of NPC problems at the moment. Work your way up to the top floor and find the real cat statue. The 5 fake cats can be found on the way, spread across the house.