Don't know exactly what I may have misread or misunderstood. As I noted earlier, and as I noted when I first mentioned that (apparent non-)fact, "HF was out of town" was what I had understood to be the consensus knowledge (and I noted at multiple places that my thoughts about HF's silence were based on his whereabouts "if I understand correctly"). But I don't know where I got that (apparent mis-)perception, and was not intending to offer anything new or different to the discussion. If I was mistaken in my understanding (and it appears I was), my apologies to all.
So back to the topic with better info ...
Assuming that HF was NOT out of town, then it's beyond odd that he wouldn't have noticed. I have to believe LE had lots of pointed questions on how she could be missing from Sat morn to Tue eve without him wondering and raising any alarm. And then, he only began to wonder when CM's boss contacted him as emergency contact? That explains why they took forensics on HF's phone, to be able to ascertain who he was in contact with. The DNA puts her in EA's trunk, EA was hiding his actions and erasing his phone data while HF was not, and the phone forensics on HF's phone apparently ruled out some sort of something where HF and EA were in contact and possibly planned something nefarious. But he's an incredibly low-caliber bf, it seems like, to not even be concerned by her absence.