What items are you talking about? Appliances? Just give an idea.
The settlement company won't even refund the deposit to you instead of the sellers unless you pursue this asap and in writing, and even then, they work for both parties equally. Even if you mediate, you may end up only seeing half of the deposit.
This is really shady behavior. You need to contact your agent though, and the agent needs to contact their agent. They didn't fulfill their part of the contract and you need to have someone point that out to them and see if they will return the items first, and if not, then you get a lawyer involved.