Basic drafting:
Set running osnaps to END or INT, and PAR
MOVE command, first point on the first box to move from an END or INT, second point on a parallel line you want to align.
Repeat for all other boxes.
OR what the rest of us do (and reason for version question):
turn on Object Snap Traking
Set running snaps to END or INT
MOVE command, first point on the first box to move from an END or INT, second point, without clicking, is an END or INT on the box side you want to be parallel with, then drag down to snap and align.
Repeat for the other box.
OR the 'wuss' way:
Draw a line from the first box.
Move your boxes and snap to parallel to aling.
Erase line.