Bullshit. Logging on to someone's email without their consent is a felony, there is no fucking way anyone associated with IT is going to straight up do that, especially someone who repairs computers for a living. It's perfectly clear what happened here.
Hunter dropped off three laptops and some other equipment for repair. They were repaired. The shop owner followed up with Hunter as to when he was gonna get paid. Hunter didn't respond, because reasons. The store owner considered them abandoned, took them into his possession as per contract, and having already been provided the login password (needed for repair) he found tons of incriminating data stored in the HDD.
Now this begs the question why the fuck would Hunter abandon a Mac Book Pro with all that data about shady deals, drug use and maybe CP over eighty five measly dollars. Hunter Biden is a millionaire after all, it doesn't make sense. So I conclude that 1) Hunter isn't in fact a millionaire and $85 (plus whatever he could get from the foundation for replacements) mattered to him 2) he's a junkie and really needed the cash for drugs and 3) he didn't think there was any incriminating data on the computers because he thought he'd already wiped the laptop.
Taking the first point, is Hunter really a millionaire? Likely not, he' has a major league drug habit which isn't cheap and most of the money he was making he'd have to kick upstairs to his old man and whoever else. If he was running short on cash a few hundred dollars for the next hit would have REALLY mattered, so I totally understand why he'd stiff the shop owner. But how could he possibly have believed he'd wiped his drive when he obviously hadn't? I'd put that down to a boomer tier mistake, Hunter is 50 years old after all. He didn't understand that syncing his Maacbook to his I-Phone and his gmail automatically stored his entire email, his text messages and any attachments received or sent as a local copy on his computer. He didn't worry about leaving his laptop because he didn't know that the stuff was on it. Why would he? He was sending texts with his phone, he was emailing via his gmail server. It was a dumb mistake, but completely understandable.