vintage brass holy oil door w/ raised cross, architectural piece from old Catholic church

Old solid brass door from a Chrismatory, out of a Catholic church. It's 10" tall x 8" wide, engraved Olea Sancta. Has no hardware or key.

We've been told this came out of a church in the Milwaukee area (years ago), but I don't know what church it was. I love the simple arched shape and the cross, and think it's beautiful, especially if you have a few other pieces to display with it, with this as a background.