/usr/share/tesseract-ocr/tessdata/configs/rebox is in libtesseract-data 3.04.01-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | tessedit_resegment_from_boxes 1
tessedit_make_boxes_from_boxes 1
|