Pack all cartons as tightly as possible without overpacking so the top cannot be closed or the top bulges out. The movers will be stacking your boxes on dollies. Underpacked boxes can be crushed and overpacked boxes cannot be stacked.
All contents from desks and credenzas must be packed. The movers will be standing them on end to get them through doorways and items left in drawers are likely to fall out.
Glass desktops and large desk pads do not need to be packed but they do need to be labeled.
Standard upright filing cabinets do not need to be packed as they can be moved as is. Lateral filing cabinets must have their contents packed as they are likely to be damaged if they are moved full.
Supply cabinets must be empty.
Bookcases must be empty.
Large pictures, maps, bulletin boards and white boards do not need to be packed. The movers will take care of them. Small pictures should be wrapped in paper and packed.