Louisiana law is weird - I am from there.
When my mother died, intestate, her "share" of the community property was divided between my father, my sister and I according to Louisiana law. When my father died, also intestate (seems my parents had a thing about wills) his property was divided between my sister, me, and my stepmother. Added to that, when the house was sold, was my sister's and my original inheritance from my mother's share.
Confused yet? LOL You should hear my grandmother's story when my grandfather died! Yowza - he had heirs from a prior marriage that we couldn't even find.
Anyhoo, You need to hire an attorney to represent you - one that knows Louisiana inheritance laws. Unfortunately, it is not illegal for one set of heirs to clean out and remove personal property. Tacky, and petty, yes, but not illegal. However, if you retain an attorney then you can require an inventory of the personal and real property.
I wish you luck. I don't understand how the death of a loved one can bring out the worst in some people - but it seems that is the case for your sisters.
I am sorry for your loss.