Lost credit card: If there are no delinquencies, credit cards that are reported lost will continue to be listed for two years from the date the card is reported lost. Delinquent payments that occurred before the card was lost are reported for seven years.
Only effect would be if they open a new account with a fresh start date. Usually they just assign a new number and put it back on with duplicated history.
I would like to know if this is hurting my score also, I have a lost card reported from Nov 2002, no late pays, no balance, had less than a year, but it is still on my TU.