I already knew which albums you were talking about. But yeah, it's kind of frustrating to guess which albums came out at which month, maybe even which year in many cases. That's why I usually go by animations on certain albums. If there's a cry that was used during that time period, then that album also came out during said time period. For example, if there's an album where the atalaku uses cries such as Helicoptere, Shofele and Kilumbu Ka Kiesse, that album probably dropped between late 1999 and mid 2000. Or that album could be Solola Bien, one that popularized said cries.
With artists like Koffi and Bozi, I have an idea on when their albums would drop back in the day (usually in time for Christmas, and around the same time), and even then, it's just an idea, not evidence. It's hard to tell that Loi and Bana Saint Gabriel dropped in the same month.