If by boxes you mean the contact report boxes on the map, remember those are only where the ships were at the time of the report. The ships are moving while the boxes stay put but click on those boxes and you see some additional info like rough course and speed estimates. Use those estimates to plot where you will need to go to search for and hopefully find the ships. Keep in mind that any uncertainty in the plot increases with distance and time. Personally I never bother with those reports if I know I can not be sure I will be able to pick them up on my hydrophones.
If, on the other hand you mean the visual contact boxes that DO move and that turn into ship icons when you zoom in on the map, then I have no idea.
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