You´d think the EP would want to keep the physical evidence simply because they know that Jeremy keeps appealing his conviction. With the evidence intact they would be able to effectively put a stop to Jeremy´s constant appeals - or not?
Funny how it happened in 1996, exactly around the time DNA science gained massive ground and proved the innocence of a multitude of prisones who were released from prison - many of them from death row in the USA. Just a funny little detail that makes you wonder.
The people who destroyed the evidence made a conscious decision to go into whatever room, take the boxes containing the evidence, then destroy/discard it somehow. All the while knowing that what they were doing was ILLEGAL. They must have had REASON to take such a chance, you´d think.