Interesting. Thanks for posting the link. My first reaction is that the prevailing ocean current wouldn't have carried the wings toward Boston but in the opposite direction. Thoughts?
I'm not an oceanographer, but I've visited an olive farm planted by one (may he rest in peace).
(http://tighar.org/aw/mediawiki/images/thumb/5/55/Howard_olive_farm.jpg/320px-Howard_olive_farm.jpg)
I suspect that it is not a simple situation. The Gulf Stream is a deep ocean current that runs clockwise (more or less) in the Atlantic basin; but that doesn't mean that surface currents follow suit. It seems to me that it would not be unreasonable to suppose that temporary or recurrent wind and wave patterns might carry debris in a direction counter to the Gulf Stream.
This image from http://www.anthonares.net (http://) suggests that there is a deep return flow that goes southward along the Atlantic coast:
(http://www.anthonares.net/gulf_stream_1.png)
The famous rubber duckies (http://www.dailymail.co.uk/news/article-464768/Thousands-rubber-ducks-land-British-shores-15-year-journey.html) seem to have floated south along the coast.
To calculate the odds of the wings drifting to where the Coast Guard saw them, you need some facts and some guesses. How long was the sighting after the loss of the plane? Where do you think the plane came down? How rare and unusual a circumstance would you need to get the wings from the crash site to the Coast Guard ship that might have seen them?