Yeah, that was a dumb thing for me to do, sorry.
But this is the (sometimes very tedious) method I use daily.
I try to read every new post but now, with almost 9k members, I can only do my best to scan through them.
When I see an unfamiliar OP name that has only a couple posts or so, I click on it and choose "find more posts by" this OP, and go back to the first one they made and see if I had already welcomed them.......
The OP we are talking about made his second post ever a couple days ago, I went back and saw that I hadn't welcomed him, didn't realize it was in 2013, and posted a welcome. Sorry, I should have/could have posted a belated welcome in the current thread he posted in.
Believe me, this unpaid Moderator job consumes WAY too much of my time, but I'll continue to try to do my best.