>The technical reason for the seizure was trademark violation.
Do you know what a trademark is? This wasn't a trademark violation, it was a fake certification.
The reason for the seizure is I don't want electronics in my house that could burn it down. UL cetifiies that. That's NOT a trademark. That's a certification.
You really don't seem to understand that you were caught trying to import bogus goods. It's also concerning that you are mixing up terms (trademark vs certification), as it casts doubt on the one side of the story I am hearing from you.
I get that it may not be your fault, but the CBP doesn't know that. They don't have a crystal ball to know that you were innocent of it, nor are they EEs who can figure out that's real and what's not. They also shouldn't be. Use a more trustworthy supplier next time.