DAV is very guarded with the covers returned with contributions: Perhaps extremely protective of its contributors, DAV does NOT make "used" covers available to collectors.

However, there is at least one cover which somehow/someway avoided the usual destruction and survived after actual postal usage
 
 

(Click image for 300 dpi scan)

(Click image for 300 dpi scan)

 
 
 
 
 
 

(Click image for 300 dpi scan)

(Click image for 300 dpi scan)

 
 
 
 
 
 

(Click image for 300 dpi scan)

(Click image for 300 dpi scan)

 
 
 
 
 
 

(Click image for 300 dpi scan)

(Click image for 300 dpi scan)

 
 

I welcome additional information about stamps used by DAV and examples of actual usages.
 

DAV Intro (click here)

Stampsjoann (click here)