1) Click "Move" for a DiscID - any ID is fine, you won't complete the edit, so no data will change.
2) In the "Release Title" search field, type something common, like "Live" (or the name of a release you know has country, label, and cat #), then click Search.

In the list of results, the Country, Label, and Catalog # fields are all empty.

I don't know if this will work, but here's the link of the page I'm talking about: http://beta.musicbrainz.org/cdtoc/move?toc=644559&filter-release.query=Live

(from comment on MBS-2755 )