"Typical" personal / negotiable property include washer, dryer, fridge. However, a few different factors may be at work here.
1) Are they first-time homebuyers? If so, they may have almost *no* furniture of their own, especially if they come from certain cultural backgrounds.
I sold a townhome to a family who'd saved the substantial $100K downpayment, but literally lived with only a TV on a TV tray, a table & chairs you wouldn't find at Salvation Army and only mattresses on the floor. This kind of buyer doesn't relax financially until they actually own a home (they're worried they won't have enough money)--THEN they may finally buy some furniture.
My sellers were surprised the buyers asked if the sellers planned to take or leave certain items (bookshelves, dressers, etc.) until I told them the buyersâ€™ living situation. I explained they had no contractual obligation to give anything else to the Buyers beyond our original agreement (contingencies were already off) and could ask for any price they liked for certain items.
However, they decided to leave many things as goodwill, especially as the buyers were truly appreciative of the items given.
2) Are you as Sellers downsizing and/or moving far away? If so, Buyers may be thinking you don't want to pay to move furniture that doesn't fit--or would cost more to move safely than it's worth, and leaving things behind will help both of you.
3) Are you moving down to a condo/th and the buyer moving from an apt., condo or th? If so, they may be especially interested in you leaving lawn equipment, ladders, etc. It's not always greed, it's often about safety. They figure if you already own it, it must work well for the home, and better than if they go out and buy the wrong thing.
4) Does the agent or buyer come from a "continuing negotiations" culture--in many parts of the world, buyers and sellers will continue to ask for more all the way through closing--and beyond! If so, realize you can say no--and if this is accepted practice where they come from, they will not even realize they've offended you. In fact they will often be surprised to hear they hurt your feelings--it's just usual business practice and no reflection on you or how they feel about you. If so, they will also not be offended by you saying no or making a counter offer with a price.
5) OK, sometimes it IS a negotiating game; "Let's ask for these 5 things and if they give us these 2 that's more than the 1 we hoped for." Unless you have outstanding contingencies at risk, answer pleasantly and firmly, "We plan to keep to the terms of our contract as we've all agreed to in writing."