Suffice to day he was still spamming it when he got back to town, even walking back while sneaking.
To top that off, I'd been worrying about charging soul gems on this character, since he wasn't going to go for lots of magic schools or anything, and the very next chest he opens...BAM...a soul gem charging weapon!
I'm just afraid he's now used up his total lifetime allotment of serendipity and it will all be downhill from here.