Our documentation of release editor seeding is pretty old, both in text (https://musicbrainz.org/doc/Development/Release_Editor_Seeding) and on the https://musicbrainz.org/static/tests/seed-love-bug.html testing page. This should be updated, and the seed-love-bug page should include fields like packaging and show how you can seed multiple RG types, dates, labels, etc. Ideally it would also have some labeling so the user can understand what is being tested.