Go to the
patrol page. Scroll the page as fast as you can until you find a post that has more than 5 lines. Open the profile of who posted, see if the last 5 posts were larger than 3 lines with a valid and original content. Copy and paste in google to check if it is not a copy and past.
If all is correct and it seems that this newbie will help the forum, give him 10 merits.
Besides this wonderful suggestion, you can also set up a passive way at the same time. In case you missed something, we all do sometimes - It's related to this first comment in this thread.
You could start a new post where newbies/Jr.Members reply pasting the link of around 3-5 or 10 posts/replies of them they think are really good. So you can decide if reward them or not.
In fact, it's something that would encourage them to try really hard and some might even possibly research how to write better, in order to try really hard making those posts in an attempt to impress. No solution is 100% accurate, but with this two i believe you will feel comfortable being a source.