Historians are used to sleuthing. Obtaining verifiable sources is difficult; original documents may be unavailable. With computer searching methods some of the detective work has eased up, at least superficially. However search engines depend on databases that can be parsed and queried digitally. Whatever is not in these databases is unreachable except in person. Great strides have been made thanks to the Internet, and online techniques are useful tools, but their help is always limited.
The search for Rodríguez’s “Chinese Poem” is a case study in how, despite strong efforts and advanced technological approaches, searches cannot be guaranteed to succeed.