Say no to illegal stuff. Ask for permission to look inside the item packaging.
Make a deal with user who has a complete profile and good review.
Describe what you can bring
Mention clearly item specification (weight and value) that you can bring.
Make a clear deal about the payment and tip you want to get.
You can use Bistip SafePay to ensure the requester can pay you. See this Bistip SafePay page for more information.