If the "beer can" is much denser than the chassis, they should look back to the East of the Chassis location to have a hope of finding it. At the surface, the two items were initially together. As they settled to the bottom, the lighter chassis took longer to fall and was carried further to the West. We are about to see a practical application of the density sorting concept.
From the internal description that MM43 provided a link to, you have the memory chips surrounded by a thermal mass, which is then surrounded by insullation, which is then surrounded by an armoured shell. So why are the attaching feet on the memory module so small? It looks like a few whacks with a hammer would break them. The pinger module also looks like it could easily be sheared off the memory module. It really seems that they took weight savings to a ridiculous extreme in designing the unit and now it is a problem. As accident impacts go, the AF447 impact with the surface was relatively light.