If there are no key signatures used, you cannot tell from the printout alone whether the score is transposing or not, and Sibelius doesn't automate any kind of (printed) marker to tell you.
Every score should have a blank page frontispiece that includes notations along the lines of "Transposed Score", or "Score in C". You could argue that if key signatures are used and transposing instruments are present this is redundant, since noting whether the key signatures are different or not between transposing and non-transposing instrument staves would tell you which type of score it is. But still better to do it in all cases, but it is a MUST if no key signatures are present.
This issue is a relatively new development. Traditionally scores were ALWAYS transposed, so there was no ambiguity. As non-transposed "Scores in C" have become common enough, you really need to put a simple note in words on the frontispiece as to what type of score it is. In Sibelius it is up to the user to do it manually, but it is necessary.
P.S. >>"so if all 4 [clarinet] parts had been concert pitch they still could have played the piece as written. One full step difference would not have mattered"
Sibelius *always* produces transposed PARTS (for transposing instruments). There is no option to toggle on or off the transposing parameter in parts (and neither *should* there be). That option (Transposed/Non-transposed) only applies to the score. So the ambiguity can only creep up in the printed score, not printed parts, if the annotation I mentioned is not included. A potential issue for conductors and other score readers, not for players.
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Sib. 7.5: Transposing instruments & "No key" sc... - Patrick O'Keefe, 07 Jan 05:01AM