Those types of files are the worst. Usually what I do is either take it into blender (or your favorite modeling program) and combine materials that should be combined and maybe rename them to something helpful. Or I only change only the ones I absolutely need to change. And to select those, I use the eyedropper in the material room to select those images. If they had meaningful names I'd say use the assign tab, but guessing which maps x choices would make that impossible.

Since this is a complex prop, I'm assuming it has many parts (like a room that include all the furniture as one prop) You might be able to use the grouping tool to separate different parts into different props. This way while there may not be meaningful material names, you only have to work with a few at a time.

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