Oh wow, this is the first time I hear about this, but it's also the first time someone from China is ordering from D on this forum. I think he'll be doing this to make it possible to get your bottles through customs.
There are 2 big downsides of this:
1) The shelve life of your N will decrease, although I have no idea how long it'll last. Maybe other people can give you more information.
2) If you don't receive original bottles, you won't know for sure what's inside it. Looking at D's reputation, I wouldn't worry about this too much, although I'd personally not feel very comfortable to be honest. Since you most probably won't be able to test the substance in a professional lab, I would suggest to use a cheap drug test on barbiturates. But again, D has a very good reputation until this day, so I assume it will be fine.
I would remove the details about the way of packaging from your post though.