Liberty Safe is under no legal obligation to comply with a search warrant served to one of their customers. Liberty Safe was not subjected to a search warrant, per their post, they were shown a search warrant for another individual and decided to help the FBI conduct that search by providing information that would aid the search.
There is absolutely no reason they should comply at all. In the event that an individual is served with a search warrant for their home or property, that warrant is entirely between law enforcement and that individual.
If the warrant is for property that may be contained within a safe of the size the individual possesses, law enforcement can ask for access to that safe. The owner can provide that access. In the event that the accused declines, law enforcement is free to attempt to break into that safe.