I can answer that. That want to leave as much as they can so they don't have to get rid of it. Since they are going to an RV the don't need the furnishings and will probably have a sale. Or have Salvation Army pick it up, etc.
If there is a nice desk or table that you like, fine, keep it. If it is not your style, let it go.
As for the closing and not moving, they may need the money to pay for the RV so need a few days. There are ways they can get around it but would cost them money for a short term swing loan.
When we bought our last house, the seller asked that a few things could stay in the garage for a few days before someone picked them up. We did that and it was a couple of days before our furniture arrived.
This was a new house and different situation. I wanted to stay the night after we closed and a local furniture and appliance company made that possible by delivering a bed and refrigerator the day after we closed. It was a week before we had our furniture but a cheap coffee maker and a few dishes worked. It was fun, but the next time I move it will be in a zipped up body bag.