[it depends]

I can;t get that one to happen for me, but I did notice another one, after flying into a rock.

I took a jaunt into Amonkrie space to sell my Cap Ship Missile for a 2nd Toxin Injector, and after purchasing it, ran straight into a rock. Loaded the auto save, went back to sell again, ang looky there, the Cap Ship Missile I just sold them before I died is still there, sitting at the bottom, and after selling the one load on my ship they had 2. If there's unique or very rare weapons, this would be a good way to double their availablity, though it would still cost you.