Wow, 100.000 images.
That is what I would call a detailed scan.
Regarding finding the black bokes
Taking into consideration that these are relatively heavy compact boxes of simple shape, it is likely they won't drift to far even if broken free from the tail.
Had they broken lose upon impact I would expect them rather close to other heavy dense items (e.g. the engines or the landing gear). Would btw be interesting to know how far the engines were found from the front landing gear.
So even in that case I'm rather confident they will find them. May take a little while but now the area to be searched is down to a reasonable size.
And due to the above mentioned reason I do not expect the FDR /CVR to be the part of 'outliers'.
They should be either at the beginning of the trail close to the center line of the trail or inside the tail.
Also hopeful