It seems there is a new possible scam warning that is automatically posted by the forum in your conversations. I encountered it about 3 weeks ago when I was selling an item and the buyer was a new member with only 3 posts. It turned out the buyer bought 2 items over a few days from me paying by personal check and I shipped them both in the same package. I had no problems with the checks and the transaction was all you could ask for. A very honest buyer. Here is the warning that appeared in my side of the conversations:
"THIS USER IS BRAND NEW. THERE IS A HIGH RISK THIS IS A SCAM. PLEASE TAKE EXTRA PRECAUTION TO ENSURE THIS IS NOT A SCAM"
"THIS USER IS BRAND NEW. THERE IS A HIGH RISK THIS IS A SCAM. PLEASE TAKE EXTRA PRECAUTION TO ENSURE THIS IS NOT A SCAM"