The cellaret looks like a marriage to me. Apart from looking exceedingly clumsy and disproportionate, there are other clues:
1. The dividers/rails above and below the pull-out slide are very heavy and not commensurate with similar rails of the period. They appear to have been made to fill the gap between the existing drawers and what is now the top of the 'stand' rather than having been made as delicate, uniform cabinet rails or dividers.
2. The base is of a reasonably high quality and I therefore can't for one minute believe the person who made those shapely legs would have left the raw edges of the top of the 'stand' visible below the waist moulding. Again, period practices would dictate a substantial moulding with at least an inch overhang.
3. The waist moulding isn't! It's an inverted cornice moulding. Again, the maker of the base would not have made such a faux pas.
4. The actual cellaret was probably made to fit the void resulting from attaching the inverted cornice moulding to the base. It doesn't follow that the cellaret is pine yet the lid is solid walnut. The lid is most likely made from what was the original top of what ever the base formerly was. I would guess that the base is made entirely from solid walnut which would lend support to the cellaret being made-up and the lid belonging to the base.
5. The handles on the side of the base are drawer handles, not lifting handles, and look quite modern. The plate handles on the drawers also look modern, supported by the fact that the escutcheon on the cellaret is merely the bottom half of a third plate handle, crudely cut off in an arc ? again, something the maker of the base would not have contemplated.