I believe that the samples sent to the body farm DID NOT include the entire carpet from the back of that trunk...only samples. THere is lots more evidence to come from the trunk. These were hair band studies and air sample studies. That's how the description read to me, only samples.
If they haven't done it already, let's hope they RIP UP ALL OF THE CARPET AND DO TESTING ON THE LAYERS BENEATH THE CARPET, SUCH AS THE LINER THAT'S ALWAYS THERE FOR NOISE REDUCTION, ETC., AND THE BOTTOM OF THE TRUNK ITSELF.