Mark LEAP packages that they come from LEAPs debian repository

I want to find out what debian packages are installed from the LEAP deb repo. First I'd like to list what different releases are a platform server, but leap is missing:

root@donkey:~# apt-cache policy | sed -n 's/.*o=\([^,]\+\).*/\1/p' | uniq
pixelated
Debian Backports
Debian

Pixelated uses the right release tag:

1000 http://packages.pixelated-project.org/debian/ jessie-snapshots/main amd64 Packages
     release o=pixelated,a=snapshots,n=jessie-snapshots,l=Pixelated Project,c=main
     origin packages.pixelated-project.org

While LEAP doesn't:

 999 http://deb.leap.se/experimental-platform/ jessie/main amd64 Packages
     release n=jessie,c=main
     origin deb.leap.se