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No.2 on CD was officially released three times in Japan on London/Polydor K.K
P33L 25015 (1987), P25L 25033 (1989), POCD 1913 (1995). All contain the same mastering and mixture of mono and stereo tracks
Recently it was re-released in Japan in mono only (the same mastering as in In Mono box) as SHM-CD UICY-79333 (2020)
In Europe and in the ROW No.2 was officially released on CD only once - as a part of In Mono box (2016).
So if your friend has CD from the box - it is official (unless it is from Chinese counterfeit box). Otherwise - it is bootleg.
The Rolling Stones, No. 2 - released 6-Jan-2021 on [www.Qobuz.com] .