My ex has texted me. I haven't replied. Is this just a test to see if I give in?

He texted me about a necklace he found at his place and wondered if I was missing one. I didn’t text back. I don’t even wear necklaces so it’s not mine…

Why has he even bothered texting me about this? Does he really think I’d go to his place and go through the pain of seeing him again just to get a necklace back?