I dont believe that either of those product models were for sale as owned, and definitely not during that time period.
I think you just picked up a pair of leased receivers for more than list price, and if you call directv to activate them you may have to return them (since they own them) or activate them under a 2 year contract. Plus the former "owner" may be billed for a bunch of money for not returning the receivers. If you already activated them, you might want to call and check what your contract date is, because i'm betting you have one.
Jimbo...contracts are concurrent, not consecutive. The maximum contract is 2 years and its set to 2 years from your last receiver activation. So if I activated two receivers on 1/1/2009, I'm under contract for two years from that date. If I activated a third receiver on 6/1/2009, i'd then be under contract for two years from that date. If I then replaced one of my original two receivers with a newer model dvr on 3/1/2010, my contract would run to two years from that date.
So you're better off making changes earlier than later if you're concerned about contract end dates.