I've sold one of my designer bags on eBay, I've sold before but this is the most expensive one so I'm asking for a bit of advice. I will be posted it special delivery insured to £500 so posting is not a concern,. However I'm wondering if there's anything I can do to prevent a swap of some sort. Is there anything I can diy? Like a security tag? Or would it be best to buy something? I don't doubt the buyers honesty but you never know.