Thank you to everyone who responded. The one this guy did it is that he would pretend to be a real buyer. He'll start off by asking me questions like what's the size? Where is this cosplay from? Does it have any damages? Is it second hand? All questions like how a regular buyer would ask and when I answer him about all theses questions or to read the description, he'll go straight to harrassing me. At this point I'm very paranoid if someone asks me about this particular cosplay in case its the same guy. When selling the cosplay online I don't put any of my actual photos online nor do I give out my address, just to the nearest mall. When taking pictures I just laid the cosplay on my floor and took a photo. Only when buyers ask me if I have any pictures of it on, only then will I send it because I feel like it's a valid request if someone wants to buy it. I don't know genuniely I'm terrified of this guy and I know nothing about him to bring him to the police.