Previously unmentioned elsewhere, the 1997 mini-series Code of Honor has brief appearances by Cloak & Dagger.
Thematically a bit of a sequel to the highly-acclaimed Marvels by Kurt Busiek and Alex Ross, Code of Honor was a fully-painted 4-issue prestige format mini-series written by Chuck Dixon that traveled through the 1970s and 1980s of the Marvel Comics universe through the eyes of a New York City police officer. Namorita had a very tiny cameo in issue #1.
It has been discovered that Code of Honor #2 has a nearly full page silent sequence with Cloak & Dagger that takes place soon after they moved in with Father Delgado in Cloak & Dagger volume 1 #1. Additionally, Cloak & Dagger make a single-panel silent cameo in Code of Honor #3 that takes place during the very beginning of the 1984 Secret Wars mini-series. I have placed this appearance after the first Cloak & Dagger mini-series and just before their next appearances as guest-stars in Peter Parker, the Spectacular Spider-Man #94-96. Father Delgado makes a slightly more significant appearance in both issues as well.
Check out the History page and the individual pages and checklists for Cloak & Dagger to see how these two new discoveries fit in.