Have any sworn testimony to back this up?
I imagine when Mr. Bobulinski gave testimony to the FBI, he was sworn in and even if he wasn't, it's against the lie to the FBI whether you are sworn in or not. So yes, at least two people have told the FBI they have information including the shop owner who also talked to the FBI under oath I'm sure.
What crimes were committed?
Plenty if any of this is true and in the past I might have said "and the FBI will tell us" but maybe the council at the FBI changed some documents like in the FISA warrants and Christopher Wrey is the biggest criminal of them all for sitting on what he has to know is critical evidence and he has already been caught holding back such evidence with amazingly no repercussions so far.
What was the Dodgy stuff?
Sex, drugs and possibly a little rock and roll.
It is unethical for any repair shop to look through someone's data.
Not when you sign a document that says if you fail to pick up the item in 90 days, you forfeit the item and it then becomes the property of the owner.
Hunter is smart enough to not leave a laptop with incriminating evidence in a stranger's hand. Originally Posted by royamcr

Former Vice President Joe Biden’s son Hunter Biden fathered a child with an Arkansas woman while dating his brother’s widow, according to the Arkansas Democrat-Gazette.
The newspaper reports a DNA test filed in court Wednesday showed with “scientific certainty” that Hunter Biden is the father of a child with Lunden Alexis Roberts. The baby was born in August 2018, while Hunter was in a relationship with Hallie Biden, who was previously married to Hunter’s older brother Beau Biden, who died of brain cancer in 2015.
The newspaper reports a DNA test filed in court Wednesday showed with “scientific certainty” that Hunter Biden is the father of a child with Lunden Alexis Roberts. The baby was born in August 2018, while Hunter was in a relationship with Hallie Biden, who was previously married to Hunter’s older brother Beau Biden, who died of brain cancer in 2015.