OpenOffice Document Viewer is an Android app that allows you to view documents in .ods and .odt formats. Once you install the app, you can use the Box app (or any other app) to open files in those formats.

To use OpenOffice Document Viewer, search for it in the Android market on your phone, then download and install it. Once it is installed, you will be able to open .odt and .ods files in any app.