Happened to me twice. First time over $5 grand in just 20 hours - Best Buy, Target, Mens Warehouse, jewelry stores, etc., all within a half mile or so of each other.
That time, I notified the CC company two days later when I had a transaction denied. The fraud division was on it, and within two days, I was notified that they had identified the two perps - a couple - where every transaction was on video, including them getting into their car with license plate ID. They were both prosecuted, with previous convictions on record.
The second time, just about 6 months ago, I noticed a small transaction while checking my account online. Notified the CC company, and they figured it was just a test by the perps to see if it worked. They were stopped as well.
That is the main reason I check my accounts daily on line.