Of the eight major-runway directions at KBOS, five (4R, 15R, 22L, 27, and 33L) are equipped with ILS (ILS-III for 4R and 33L, ILS-I for the rest). Four of these (4R, 22L, 27, and 33L) have a localiser array some way past the end of the runway (or, in 4R's case, on the other side of Belle Isle Inlet in line with the runway).
15R, however, has no visually-apparent localiser array (this image, and all others in this question, were made by me screenshotting Google Maps), although the glideslope antenna for 33L (15R going the other way) can be seen:
Contrast, for example, 22L, where the localiser is immediately obvious:
Now, the EMAS bed just past the end of 15R does have a bunch of posts sticking up from it (visible mostly via the shadows they cast on the light-grey EMAS blocks); however, these are almost certainly approach lights, given the suspicious similarity of their arrangement to that of the approach lights on the pier beyond:
So where is 15R's localiser?