The mailing comes in a cardboard envelope from a delivery service incorporating the IRS masthead and says the notice is "in relation to your unclaimed refund."

Besides asking for contact information for taxpayers, the letter seeks information such as detailed pictures of a driver’s license. 

The letter tells the recipients they need to provide "Filing Information" for their refund and includes instructions to provide "A Clear Phone of Your Driver's License That Clearly Displays All Four (4) Angles, Taken in a Place with Good Lighting." It also requests recipients’ cellphone numbers, bank routing information, Social Security numbers and bank account types.

The letter warns the information must be provided for the recipient to obtain a refund.