I've only just noticed that if a dweller returns from the wasteland and haven't used up all the stimpacks/radaways it doesn't get put back into storage. Is this the case for everyone?

Never really bothered to check, as I pretty much always have them at max. stock and produce new ones every few minutes. But I can imagine they're much more valuable when you still have a small vault and limited production. Would make sense if you'd get them back.