RadioShack says the discovery of thousands of discarded store records -- some with credit card and Social Security numbers -- is an isolated incident.
KZTV television in Corpus Christi reports a man in Portland, Texas, found the documents last week in a trash bin behind a RadioShack store.
Larry Smith says he was stunned that the Fort Worth-based company would be dumping the information.
But RadioShack vice president Steve Schmidt says what happened is not normal company practice.
Schmidt says RadioShack takes seriously its obligation to maintain and safeguard its records.
RadioShack has taken possession of the documents, which should have been shredded.
The items included applications for RadioShack credit cards and for mobile phone service plans, plus internal sales receipts.