I have the same issue on a White cabinet I purchased last summer. What I had found was...
Some original moldings can be found on
www.vandykes.com, or if there is otherwise another full molding on the same cabinet Plaster of Paris can be used to create a casting which can be faux painted to look like wood, or used to create a mold that can be filled with either putty moistened with linseed-oil and mixed with wood chips, or Plaster of Paris mixed with methylated spirit.