It´s worth looking, for sure. I know one of the yards near me has a gen2 turbo RX7 with a LOT of high end suspension pieces. I think if I had one of those cars, I would have stripped that particular one clean by now. I guess if you´re going to find coilovers at the yard, the will most likey be aftermarket. If this is the case, a cheap measuring caliper would be handy so you could measure the strut/shock body diameter to see if the threaded collars will fit yours.
BTW, the ZX2 S/R came optional with adjustable ahocks and coilovers from the factory.