Nice job on the Norweb cats. These, if in good condition certainly have good value in themselves & helped if perhaps you have the prices realised. In some series of later milled, she (Ms. Norweb) had apparently the only known specimens of particular dates and types so is the "go to" source. As we've been taught in American detective shows, I'll take the Fifth [amendment] in not being able to divulge specific whereabouts although I quite agree with Rob that these were widely dispersed. Her original collection envelopes nearly always have the iconic spiderweb with included "N" stamped on the backside. There are some other Spink cats that are quite worthwhile in there possibly as well, so nice haul there.