I can see Graf's is taking some "ring around the scammers" safety measures. I wouldn't doubt that they have already been hit.
I do know they got hit very hard about 3 or 4 years ago. I remember that because I bought very large amounts of brass and bullets on two cards. Two days later my fraud dept was shutting down both cards.
At first I thought it was just my large purchases, but no, the scammers took near $15,000 in 4 hours. I was buying stuff all over the country, haha. I called Graf's the next morning because I rarely used those cards and they acknowledged they were hammered. Luckily, I got all my money back from my bank in 3 days, but it took Graf's much longer to increase their safety methods.
They are probably my #1 go-to dealer prior to current conditions, but now I just grab where I can.