or this...

It doesn't melt down into massive globs - molten stuff tears apart due to aerodynamic shear. If you consider a 12" cube of metal - about the equivalent of this probable meteorite - it would mass around 200 kg. Aluminiun and lighter alloys would, of course, mass rather less. Pure ALuminim would mass 73 kg

The heatshield in total massed only 78 kg, so unless a wildly disproportionate amount of structural melting occurred, there is a physical impossibility that this object could have come from melting of the heatshield.

You then have to consider whether it is more probable that this exotic object was once an iron meteorite, of which there should be millions to billions on Mars, or a fragment of a man-made or ET craft, of which there should be no more than dozens...