How can I make sure I don’t have return issues as a seller?

Hi! I’m very new to selling on Depop. I just sold an item that was pretty pricey, and am a little anxious. I’m worried that I will be told my item is fake, and will be sent back an actual fake one as a return instead of the one I sold. I got the current item authenticated, but what is the best way to go about this? Please also let me know if I’m being too paranoid!! Thank you in advance!