No worries mate. I think I was too excited to hand my hands on some gainz that I didn't take precautions. If you did want to buy from someone over the net, do the following-
1. Ask for time stamped pictures of your want-to-buy gear.
2. Ask them to send you a facebook message so if shit goes down you know who they are, and I guess it also verifies that they aint a cop.
3. Try a small sample if your scared that it could be bunk. Get blood work done to confirm.
4. Now you have a new best friend who you trust.