With regards to weapons/concealed carry, LA considers the vehicle interior essentially an extension of the household. You do not need a concealed carry permit to maintain a loaded weapon in your vehicle.
Better hold your money. Unless the weapons were being carried concealed, or the persons possesing the guns were convicted felons, what they were doing was likely perfectly legal under Lousiana Law.
LA Constitutional provision"
"The right of each citizen to keep and bear arms shall not be abridged, but this provision shall not prevent the passage of laws to prohibit the carrying of weapons concealed on the person." Article 1, Section 11.
From the NRA ILA site's LA page:
No state permit is required to possess a rifle, shotgun, or a handgun. It is illegal for any person who is a national of a country with whom the United States is at war to own, possess, have custody, or use any firearm. It is unlawful for anyone who has been convicted of certain crimes of violence to possess a firearm for a period of ten years from the date of completion of the sentence, probation, parole or suspension of sentence. It is unlawful for any person under seventeen to possess a handgun on his person, but this does not apply to any person under seventeen who is attending a hunter`s safety or firearms safety course; engaging in practice in the use of a firearm or target shooting at an established range; hunting or trapping pursuant to a valid license; or traveling to or from one of the above activities.