Get an attorney knowledgable with civil forfeiture immediately. You may have specific timelines to challenge the seizure. You are not going to be taken care of by the government without legal action. While you may have a case, you are in an expensively-bad place right now. Getting legal advice is the only chance you have of protecting your interests.
When you are a Bear of Very Little Brain, and you Think of Things, you find sometimes that a Thing which seemed very Thingish inside you is quite different when it gets out into the open and has other people looking at it.
--W. T. Pooh (aka A. A. Milne)