These first two guys were actually on the official camp roster, but were among the first round of cuts that were announced yesterday. de San Miguel spent part of Spring Training playing for Australia in the WBC and was mainly in big league camp because extra catchers are always needed. Wright is actually the O's number four pitching prospect and held his own over three appearances.
The other three players sent to minor league camp were Eduardo Rodriguez, the O's #3 pitching prospect who is just 19 years old, and catcher Luis Martinez and pitcher Zach Braddock, neither of whom have yet appeared in a game due to injury/recovery from an injury. I don't yet have an autograph of any of those three guys.
And here is some of the menagerie of minor leaguers who have logged some game time with the O's so far this spring. I've even added some notes when I have something "worthwhile" to say.