It's all just informal sales jargon, but box & papers can be just a box and the original warranty cert/card. Full set should be whatever the watch came with at point of sale (stores didn't all give out the same stuff so there's no official international standard). If it's box & papers and a booklet and one tag (for example), just list what you have, or say 'box, papers and accessories' or words to that effect.
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