Wonder if he was ever really “missing” to begin with. Maybe the family was able to claim life insurance money, or there was some other reason he needed to disappear. Then after 30 years there was no point keeping it up so he was mysteriously found with no explanation.
Agreed, though I’ve found that usually dousing a fly in water (via spray bottle) is enough to surprise them & get them to drop. Once they’ve fallen it takes them a bit to dry themselves & get airborne again, that’s usually enough time to swat it and finish the job.
That works well if you just have one or a few flies - if you’ve got a ton of them fly paper is going to work much better.