Will I get back the $17 DHL charged to collect the $1 tariff on the cat toys I bought from China?

Actual event may not have occurred, but DHL flat fee is real.

"The ruling was silent on whether tariffs that have been paid under the higher rates will need to be refunded." - from CNBC

The tariffs were paid by the ultimate consumer. Importers that sue will have a difficult time proving actual damages.

Trillions even, according to some sources.