I've bought a few items and had them sent directly to me no problem. I think it looks pretty normal for my account though considering I'm in a group where items are constantly being thrown at each other. As long as you don't send yourself every single high end stamp in one go or something ridiculous you'll prob be okay. Just buy one thing at a time. Can always have the seller send you a neomail as well - like thanks for being a good NF or something.