I don't think this is a legal issue at all. Speak to management and see if you can get it resolved.

There is no requirement that the papers be in an envelope.

This is a Q&A forum, not a place to find a lawyer. You can use the Find a Lawyer tab above.

This is a Q&A forum, not a place to find a lawyer. You can use the Find a Lawyer tab above.

Even if it was their error, if you were not entitled to the money you have to repay it.

The lease is an agreement between you and your landlord, so you need to ask them. They will say no, for the reasons listed above.

I see no basis for a lawsuit against the attorney.

Realistically, your option is to fight with FB, or move your operation to another platform.

IMO they are not liable. They are allowed to question you and briefly detain you if they suspect you of shoplifting. That's what they did.

This is a medical issue, not a legal issue. You should seek a new doctor.