I can not see any of your threads where you listed an M1A for sale.
Does that thread still exist?
Who is the buyer and does he still exist?
The forum has acted up recently. Maybe he can’t see the thread, either, and doesn’t know what to do now.
A Mod can look into it and see if the thread still exists and if he has been active lately.
Rather than posting answers to these questions, just answer them yourself and seek a Mod’s help if it seems needed.