Have the actual missing evidence and available alternatives assessed. A single unavailable person should not become an assumed requirement without examining the case.
Set the preparation sequence around the facts to prove
Record retrieval efforts and identify what can be supported now. Avoid inventing a filing deadline or promising that an alternative will be accepted; the timing decision needs the complete evidence and immigration circumstances.
Premium processing shortens the adjudication step but not the preparation. Identify which alternative sources could substitute for the missing witness, such as declarations from other people with direct knowledge, contemporaneous business records, or correspondence created at the time the relevant events occurred. Weigh whether the combination already available is persuasive on its own before continuing to search for one specific person who may never be located. Set an internal checkpoint for the search rather than continuing indefinitely, so preparation can shift toward assembling the strongest available record once that point is reached. Consider whether a sworn statement from someone within the organization who reviewed the underlying records can fill the gap more reliably than an unavailable outside witness. Keep a factual log of who was contacted and when, since a documented, reasonable effort carries more weight than silence about why a particular source is missing.