Do you have a health food store in the area? Vanilla Beans would work, also cinnamon sticks, Dried Basil, Apple Mint dried (lay flat outside in the sun and put in a canning jar. Open boxes of baking soda set in the cabinet. Also dried lavender. Open a jar of cloves. Dried lemon and lime peels. All of those can be dried outside on a cookie sheet in the sun or use a food dehydrator.
I too live in a old house 1949 and I was puzzled about why the cabinets might have that "old" smell. I ask my friend Neal who makes kitchen cabinets and he said there could be a underlying factor behind those cabinets, that at some point maybe there was water damage in the wall behind the cabinets.
i too have old cubbords and the only way i could get rid of the smell is get peal and stick floor tile (dollar store) line the shelves with that and paint the rest and it got rid of the smell and the tile makes it easy to clean