G'Day Bill,
A simple QSL_RCVD='R' would do it - in a report or filter on a log form.  A log form would be best, because then you will be able to see if you actually have an email address for the operator.  You may have got it via Tools, Call Book Batch Update.  Or, if you didn't do a batch update, the log form will allow you a direct lookup to QRZ for the info.
This field is also used for QSLs that go via the bureau.  It is more usual to have a Y/N user field  that records if the card was sent direct - to keep the data (that the card was sent direct) separate from the shared QL_RCVD field.
Peter VK4IU
Peter VK4IU  
You can help by posting images of 
any errors and including your 
Logic version.