Minuscule 1506 is online now at the Virtual Manuscript Room, so you can check out the ending of Romans there. Pages 330 and thereabouts are the pages you want to consult. 1506 has Theophylact's Commentary interspersed with the text -- the commentary is in dark ink; the text is in not-near-as-dark ink. 330v is mostly blank even though the commentary is not done there.
Romans 16 is not altogether absent; verse 25 is there, and in the middle of 331r there's the last part of 16:26, and all of v. 27, surrounded by the commentary. There is a blank page (331v) before First Corinthians begins (with a crudely drawn two-headed headpiece). (KLHTOS is not in I Cor. 1:1!)
But I wonder if this MS, or at least this part of it, wasn't intended to be a copy of Theophylact's Commentary rather than a copy of Romans. Anybody know anything about how extensively Theophylact commented on Romans 16? If Theophylact didn't comment very much about chapter 16, it seems conceivable that the copyist might have skipped the chapter (or at least the greetings-part) merely for that reason.
Yours in Christ,
James Snapp, Jr.