What is the model number? If it's an old one that is actually owned, then no. If it's a new one there is a very high likelihood that it is not actually owned by the person selling it to you.
Guys,
If I buy a receiver from a private party...will I still have to re-commit to a new contract when I activate it?
Get the RID# (it is under the access card door) and call D* they can tell you if it is owned or leased and if there is an outstanding balance owed on the receiver.