Truss Blow Down
If trusses blew down from insufficient temporary bracing and the contractor put them back up without the knowledge of the truss manufacturer and gave the truss manufacturer a letter stating that the trusses were okay, is that sufficient? Do you know of any truss manufacturer who would accept this?
If there is any question at all about the structural integrity of the trusses, they should be replaced. If a professional engineer inspects the trusses, says they are okay, and signs off on it, that engineer is taking on the legal responsibility for the trusses, not the truss manufacturer.
In general, the situation you describe is dangerous and the liability is much greater than the reward. SBCA does not know of any truss manufacturer or designer who would knowingly do this.