If you "own" the system, you do with it as you will. The licensing becomes the problem of the buyer. They can use the license but won't get support unless they sign on with the local reseller. This also limits their ability to get upgrades. Again, not your problem.
You could also contact the local Aloha reseller and try to sell it to them. They will most likely buy it back from you but at pennies on the dollar. They're in it to make a profit, after all.
Then there is the other side of your business: You could always keep it there for your next tenant. Sell it to them or incorporate as part of your lease (hardware only, obviously). Sometimes it's difficult for start ups to get financing or approved for a lease for new equipment. This might make your property a bit more attractive as the POS is almost ALWAYS the last piece thought of...unfortunate, really.
Then, of course there's ebay. There is no licensing issue here. Just be aware that since they defaulted on you, they may have defaulted on a lease in which case that hardware belongs to someone else. I suggest starting with the reseller. Tell them you have the gear and you are interested in selling it. They will know whether or not it was a lease and is available. Plus, if no one is looking for it, you are not obligated to sell it back to the reseller.
