there are holdapers who will buy second-hand products and tell the sellers to meet up in a place. A place where you don't know your security.
This is far from ninja fair platform and mission.
well just to answer this.
meet up is good, both parties can be sure that the product will be check and pay after it.
danger is just all around the place.
never meet anonymous people in private place.
make sure there are crowd in your surrounding.
this will make your security better.
Oh I thought its international so I assume that it is shipped to the customer. I suggest that meet ups should be done in public area where there are police visibility or do not transact meet ips at all to prevent crimes like this. I know that Fair Ninja will prevent this things to happend because they have standards in accrediting sellers online.