A matching box and a stack of papers can make a listing look reassuring. I would still verify the watch itself. Accessories can be separated from the piece, and documents can describe a different serial.
Match every identifier
Compare the physical serial with the warranty, invoice, and service records. Check that the documents describe the same model and configuration. If one record differs, ask for a written explanation and correction.
Check status separately
Run a dated search using the serial on the watch. Read the data coverage and result limitations. A no-match does not confirm title or prove that every theft report would appear.
Review seller and terms
Confirm the seller's identity and authority to sell, use a payment route you understand, and get return terms in writing. Have an independent specialist check authenticity and condition.
Documents are strongest when they connect to the exact watch and a credible ownership history. Their quantity is not a substitute for that connection.
Match the Papers to the Watch
Verify the serial on the actual piece before relying on its box or documents.