I agree....you have done all that in my own mind could be done to satisfy any legal claim...think with catching them,, giving the opportunity to claim/take care of them.....you would be doing a very humane thing to sell them to cover your costs.sounds like you had a way to address the situation that could
satisfy everyone.......at least you gave the former owner a chance
to reclaim at no cost to them........if they won't claim them then
they won't care for them........just my 2 cents.