Just a few tips to help you out.....from what I know the BR-525 decks, being play units only came with the TBC boards, unlike the 822U recorder unit which were optional. I know since I own one.
It would also help if you were able to list the drum hours on the unit, so that way any potential buyers will know whether to get the deck serviced and to know its condition. Due to the weight of these units these decks MUST be double-boxed and well protected on all sides, especially the front panel to avoid damage to the circuitry.
Good luck with the sale!