Labels drag feet on RIAA certifications all the time. According to RIAA, The Chronic been stuck at 3x platinum since 1993

the label gotta pay for the certification and provide the proof, a lot of times they don't bother
That Saga Continues album sold 186,000 week one and stayed on the charts 19 weeks, no way it ain't go gold eventually. And there's not a bunch of big name guests on there. Let's Get It and Bad Boy For Life got a lot of play on the video stations and radio. It did about as well as it could given the artist lineup on there. The Remix album did better because they had a bunch of star guests on there
Like I said Puff was never seen as a serious solo artist who was gonna go multi platinum off his name alone, No Way Out was an all star album with great singles, elite production, unlimited sample budget, elite ghostwriters and multiple appearances from BIG, Mase and Lil Kim at the peak of their popularity, Lox and Jay both had a heavy buzz at the time and was on there