A little bit of worry is always healthy.

AMEX caught fraudulent use on my Amex Plat, which is weird b/c I've only been using that card for Amex Serve offers--including staples.

Then about 10 days later, Citi called me to tell me that someone was trying to gain access to my account by telephone. I used that card on the $20 staples GC after buying VGCs at staples deal.

It's impossible to know for sure, but my store was hacked and the time frame is right. The last time I had a compromised card was 6 yrs ago. Yes, I got new cards and the fraudulent charges refunded, but it's still a hassle.