Check your junk mail: Americans receiving stimulus money on prepaid debit cards

The Treasury Department is warning Americans to check their junk mail, because their stimulus money may arrive in a prepaid debit card.
The government is sending nearly four million people prepaid debit cards instead of a paper check, to get the money delivered faster.
However, some people are throwing the cards out, either not realizing what it is or thinking it's a scam. In order to activate the card, recipients are required to give personal information to an automated system.
The cards can be replaced, but there's a fee.