I got a notice from inkFrog giving me an insurance number. There was absolutely no information that indicated what purchase it applied to. I emailed inkFrog asking for the information. Heather responded within minutes, saying I should contact the sellers I'd purchased from recently. Case closed.
If she thinks I'm going to contact a dozen or more sellers, she's nuts. I'd rather not have insurance anyway. On average it is never worth it. If I do figure out which seller it was, I'll think twice about buying from them again.