[AySz88]

Instead of this:

for pos in box_pos:
    if box_pos [0]== 3.0 and pos[1] == 4.0 and pos[2] == -5.0:
      print box_pos, 'The Box is connected properly move to next connection'

you want something more like this:

if box_pos[0] == 3.0 and box_pos[1] == 4.0 and box_pos[2] == -5.0:
  print box_pos, 'The Box is connected properly move to next connection'

...

You may also want to compare positions approximately (i.e. "abs(box_pos[0] - 3.0) < 1e-3") to avoid any problems with rounding error.