Because much of the relevant information is either uncaptured or unstructured, personal communication with the original authors via email on phone calls is often necessary to make sense of any raw source files (if they can even be located).
Vines, Timothy H., et al. "The availability of research data declines rapidly with article age." Current Biology 24.1 (2014): 94-97. https://doi.org/10.1016/j.cub.2013.11.014