RIAA 4X Platinum Sales Award-Nirvana-Nevermind

I just recently acquired the original RIAA 4X Platinum Sales Award-Nirvana-Nevermind presented to Nirvana to commemorate the sale of more than 4 million copies of the DGC album, cassette and cd Nevermind. It is very authentic and includes the RIAA Hologram and the sticker on the back Fitzgerald Hartley Marketing! It's part of a rare collection I own of authentic Nirvana Nevermind memorabilia. I was also told that it was part of Kurt Cobain's estate. The RIAA award was originally auctioned off at Bid2 Beat Aids many years ago. My question is would anyone know how many of this particular RIAA 4X Platinum for Nevermind would have been made that actually reads "presented to Nirvana". In addition, would anyone know approximately how many of these plaques would be manufactured for others that it was presented too also? Thank you Would be happy to send a photo of the award if anyone is interested. It is in excellent condition with the exception of a light scratch on the aluminum or chrome frame. My email address is [email protected]. Thank you for your help...