OOC:
I'd have to go back and check, but if the horses were purchased with group loot, they would probably leave them If they were paid for by the individual PC, those would be "personal property".
Angel
did pay for his own horse, so he would have left with it. Kelric's horse was bought for him by Sister Alice, so he would have left that one in the stables. Coulson's warhorse was probably given to another PC after the dwarf's death, and I believe Loken was riding thast one, so we'll assume Lokken left the warhorse in the stables when he left. So I think you have Kelric's Old Horse and Lokken's warhorse.