Gold, platinum, etc. is based on the number shipped, hence the phrase "Shipped gold, returned platinum."
My old label, when I once checked, had Soundscanned numbers of around just a few hundred with actual sales of 2000 or so, so I don't believe the scanned figure is a terribly accurate picture for "whitey" indie-rock labels. Most small indie stores don't participate in Soundscan, so they have a formula for extrapolating indie sales based on the few that do participate.
Also, there is lots of scanning manipulation for big labels. Stores get paid via free product to scan titles even though these don't represent actual sales.
― Baked Bean Teeth (Baked Bean Teeth), Friday, 13 February 2004 21:05 (twenty-two years ago)