I just had an e-mail exchange with Jerry Rossano-N4JR over in Hollywood, Alabama, who has been sorting and distributing the single-letter "J", "O" and "R" prefix cards for as long as I can recall.  He offered this update on the 4th District:  

You probably heard that the two 4th area Bureaus combined into one.  I took on the double-letter "O"s and "R"s, added to my original single-letter prefix "J", "O" and "R".  Shouldn't be a problem as the QSL business has dropped off considerably since the advent of LoTW.  Looks like the new regime will be shipping me cards at smaller intervals than before so that should make sorting a little easier.

 

The dramatic decrease in physical QSLing undoubtedly reduced the need for two bureau operations in the 4th district.  I see that the "winner" is the

Sterling Park Amateur Radio Club
Call Box 599
Sterling, VA 20167

 

So, if you have a 4th district call sign and use the bureau system for incoming DX cards, the guy who sorts and mails out those cards to you may have changed.  If you had sent SASE's or dinero to either of the former two bureaus, I reckon they will be forwarded to the new sorter is necessary.  We know that Tom-KN4ONE was surprised when he received a QSL packet from Jerry several weeks back.

 

BTW, with regard to the outgoing bureau service, you know that it is just for QSLs to DX stations.  However, there is one exemption.  If that DX station has a QSL manager in the US, you can use the bureau to send a card to that manager.  Over the years, I have received a number of stateside QSLs via the bureau for some of the DX stations for whom I manage QSLs.

 

73, Jack-W4JS