A Browns Valley man allegedly was caught in the act of using stolen credit cards, after the victim was able to track his purchases online. The woman, a resident of Iron Horse Place in Grass Valley, called Grass Valley Police at just after 11 a.m. Sunday to report a burglary. It was not clear how the man, identified as David Denniston, had obtained her cards. The victim said she believed he entered her residence through the front window and stole her cards, a laptop, her house key and a purse belonging to her daughter, while she was asleep upstairs. A …