What do I do if the seller has removed things that should not have been removed or has failed to remove things that should have been removed?

Contact your real estate agent and attorney immediately. If you notice this during your walk-through inspection, it can be addressed and hopefully resolved prior to closing. Otherwise, it may be necessary to pursue the seller for the return or cost of the improperly removed items or for the cost of removing and disposing of items that should have been removed prior to closing, as the case may be.