The Fall of the House of Usher: How did Pym find out that Pamela was one of Verna's disguises?

In the sixth episode of "The Fall of the House of Usher" titled "Goldbug," Pym, the Usher family attorney, uncovers some intriguing information about Verna's true identity. After Victorine's tragic murder-suicide, Pym searches the crime scene and finds documentation related to a patient named Pamela, who is revealed to be one of Verna's disguises. Pym investigates further and discovers that Verna has been associated with powerful individuals throughout history, including Mark Zuckerberg and Edgar Queeny.Pym's investigation takes him to an address provided by Verna, but it turns out to be a fake location. However, he discovers that the house used to be the residence of Roderick and Madeline Usher. Despite this compelling evidence, Roderick refuses to believe Pym's findings. He dismisses the pictures as potentially forged and stands firm in his denial, even amidst his own visions and hallucinations.Meanwhile, Tamerlane, one of Roderick's children, faces her own struggles and encounters with Verna. Tamerlane is working on launching her wellness subscription service, Goldbug, but she experiences sleep deprivation and begins to see things that may or may not be real. During her presentation, Tamerlane catches glimpses of Verna disguised as Candy in the audience, causing her distress. The visual presentation, meant to showcase Tamerlane's achievements, unexpectedly shows images of Candy instead. This culminates in Tamerlane's outburst, where she throws her microphone in Candy's direction and accidentally hits Juno, her stepmother, causing chaos.As Tamerlane searches her house, she sees reflections of Candy in the mirrors and grows increasingly anxious about her presence. The episode ends with Tamerlane falling onto her bed, impaled by shards of glass and her own fireplace poker, as her obsession with Candy reaches its breaking point.Additionally, the episode delves into Frederick's deteriorating mental state and his tormenting of Morelle, his wife. Frederick becomes increasingly paranoid about Morelle's alleged infidelity and refuses to accept the reality of his siblings' deaths. He administers a paralyzing medicine to keep Morelle weak and questions her relentlessly about her relationship with Prospero. Frederick's actions highlight his own skewed perception and hint at his impending downfall.Overall, "Goldbug" provides compelling evidence regarding Verna's true identity through Pym's investigation. However, Roderick's refusal to acknowledge the evidence, along with Tamerlane's harrowing experiences with Verna/Candy, adds layers of complexity and uncertainty to the story. As the Usher family faces their own demons and confrontations, the episode sets the stage for further exploration of madness, deception, and the unraveling of the Usher family in future episodes.