Stations That Have Not Responded to Direct QSL Requests

I generally QSL DX stations worked on new bands/modes via the bureau. Occasionally, if I need the QSL for an award and I have not received a reply card via the bureau after a reasonable period, I will send a second QSL direct, always accompanied by (for US destinations) an SASE, or (for DX destinations) a self-addressed airmail envelope and several dollars (nowadays typically $3, or more if I am requesting multiple cards), hidden as carefully as possible within the sending envelope.

NB (1) If the station operator posted different instructions somewhere such as on qrz.com, I tried to follow those instructions.

NB (2) Some stations have more recently stated that they no longer respond to requests for paper cards. Nevertheless, there was no such indication at the time at which I submitted the request to which no response was received. 

I realise that there are many reasons why I might not receive a response to such a direct request, many of which are not the fault of the other station. Nevertheless, reading around the Internet, some stations do seem consistently not to respond to QSL requests -- even some that advertise that they respond to all requests no matter how they are received.

Emphasising that some of these stations may well be blameless -- international mail in particular seems always to be a bit hit-or-miss -- nevertheless here is a list of those stations to whom direct QSLs have been sent, and from whom no reply was received. All the pertinent QSOs were made in 2010, so there has been plenty of time for a card to arrive via any method.

Station	Manager
CO6LP
C6AMS	NA6M
HP8/NC6Q	NC6Q
OA4BHY
PJ2A	N5UCF
PJ5/AA4NC	AA4NC
PJ7/K5IL	K5IL
PZ1EH
UN7PL
V21C
YT8A	YU1EA
7V2PI	EA5FL
9K2MU

If you are on this list and believe that I have made a mistake (it happens often enough -- keeping track of several thousand QSLs per year is not an error-free process) please let me know and I will investigate further.