yes, you can. its still stolen.
Someone is dealing in stolen property by buying or selling property they know to have been obtained unlawfully.
About the same as for the person who initially stole the property. Since you are selling known stolen property, one could face the same charges or more. See: http://pelleylawgroup.com/practice-areas/property-crimes/possession-of-stolen-property/
The "original thief." Well, there is a concept in common law that prevents a harmless middle man engaged in a business from being liable if he/she acquires property in good faith and without knowledge of it's theft. Since you obsviously know the item is stolen, you probably shouldn't be asking questions such as this online. However, in most states, if you take property that is stolen and help the thief in selling the item, you are an accessory. You can be held accountable for this.
It depends on local legislation and the circumstances of the case.
You'd be arrested for receiving stolen property, but if you didn't give the cops the name of the person who stole it you'd be charged with stealing it yourself.
You would not be in trouble unless there was reason to believe you knew it was stolen and participated in selling stolen property.
Possession means that you have the property, chances are you knew it was stolen. Receiving Stolen Property means that you got it and you knew it was stolen. Typically this would be the person that bought it from a thief.
Yes, and you should report to protect yourself if that gun is used in the commission of a crime.
No, I have never unknowingly sold stolen property.
Double Jeapordy applies to any and all crimes. Are you sure you understand the meaning of it? You can be charged with separate charges of Receiving Stolen Property as many times as you purchase stolen items - even from the same person.
You don't. Purchasing such a vehicle could result in you being charged with receiving stolen property. If you are purchasing an abandonded previously stolen vehicle from a police auction, they will provide a clear title. Otherwise, steer clear of such transactions.