If this plane actually crashed I think it, or pieces of it will be found at some point. The only way I can see it not being found is a controlled crash landing in water, similar to the hudson incident, where the aircraft remains intact and then sinks without anyone getting out. Any severe impact to the water would destroy the fuselage and leave a lot of pieces floating in the water, some of which will eventually be found, reach a shore, whatever.
If pieces turn up, studying ocean currents could help locate the main wreckage, of course that all depends how much effort is put into this.
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