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First, let's remember that the reason why the cops were interviewing Dassey is because he told his cousin something about the incident.
Brendan reiterated several times that Avery told him not to say anything, and that he was afraid of Avery. In a later interview, you learn that Avery had beat him and sexually assaulted him before.
He told the cops that Avery tied her up and stabbed her.
He told the cops that Avery hid the truck with tree branches and a car hood.
He told the cops where Avery hid the truck.
He told the cops that Avery had cut his finger.
There were plenty of instances where the cops tried to get Brendan to provide details and he resisted. Why did he make the stuff above up, but refuse to make things up at other times?
At this point, Dassey as telling the cops that Avery had told him all of these details. They didn't believe that, they believe that Dassey was there the whole time this happened, which is why the subsequent interviews happen, where they suggest more specific details about things that Dassey had already told them.
Then, even if you don't believe any of the confessions, how did Brendan know about the purse and cell phone that were burned in the burn barrel? The cops made sure to keep a lid on that.
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