I'd be careful about sending the owl back. She might've had to steal it, and if it's going back into the camps, there's a fair chance it'll be intercepted. if it's traced back to her, you've lost your source. and if they find out that someone can get through department of mysteries stamp, that's also problematic because they'll change protocol so she won't be able to do it again. so if you do send one back, I'd keep it super simple -- message received, many thanks. and if you can mention the stamp in a real vague sort of way -- "the way you found out your news is very useful. I'd like to know more. how did you manage it?"

course you're a smart sort, you've probably figured on all that already, but it bears repeating for caution's sake.

that's good news though.

they were at Lily and James' wedding, weren't they? Al probably remembers them better.