I thought something off re: 6pm - for reasons stated on thread - for many years prior to DV. Also, that there was an urgency & tension around lost belongings - source AS & Brookner etc - it’s very plausible & understandable, IMO, she’d want & need them back earlier rather than later.
I agree with you that the answer to this mystery isn’t complex. It’s either JC or it’s someone almost hiding in plain sight potentially. DL herself said as the person buying the property with SL, involved in this ‘scheme’ never came forward, wasn’t identified & must likely be linked to her disappearance. Their contact details or a reference to them must have been somewhere.