Hello Andreas,
In the latest commit sec-blend-gen-control handles the following cases for missing packages:
A) Packages that are not found inside the archive but look "suspicious" for changed name (updated name/replaced by other package)
B) Missing packages containing numbers in their name (a newer version of this package might be available)
In order to make sec-blend-gen-control to print warnings for such packages you need to provide -w argument:
devtools/sec-blend-gen-control -b debian-edu -D -S -c -w
devtools/sec-blend-gen-control -b debian-med -D -S -c -w
In debian-edu there are packages from both A,B cases, so checking for such cases was a nice idea :-)
Kind regards
Emmanouil