I purchased my first ever new Gibson about 2 months ago, LP Traditional Plus, and the guitar and the case has that vanilla smell. The case most likely has it because the guitar was inside it. Prior to this, I have purchased new Gibson cases, one for an SG and the other a V and they did NOT have this vanilla smell. I can assume because it never had a new guitar with the nitro finnish in it. I have also purchased new TKL cases (same case manufacturer) and never had the vanilla smell. I'll go with it being the Nitro or even buffing compound, but whichever, it's from the guitar, not the case glues, has to be IMO.