I've got a pair of scouts in my current DF game, and they fire off a lot of arrows. While one (the surviving one, actually) has just gotten a Cornucopia Quiver, there are still a lot of non-magically generated, non-disappearing later arrows to worry about. Fine ones. Magic ones. Envenomed ones. And ones with specialty heads, too.
What if you want them back?
Here is what I've been doing.
Arrow Recovery. For simplicity, 50% of arrows are recoverable. This can either be done straight-up (fired 6, recover 3) or by rolling a handful of six-siders and getting one arrow back for each 1-3.
Circumstances affect this by GM/player judgement call. 100% hits on a soft target might mean you can recover 5 in 6 of them. 50% hits on a distant, hard target and looking much later than the fight might mean only 1 in 6 are found, if that. I cap this at 5 in 6, because there is always a chance the arrow is broken, bent, cracked, or otherwise damaged, or that it buried deeply in bone or leather or steel and cannot be removed intact. Quality of the arrow (Fine, etc.) gives a +1 to the roll, as it's assumed to be better made. Again, it still caps at 5 in 6.
Yes, you can use Luck on this roll, since my players always ask that.
Arrow Poison. It's all one-shot, as much for bookkeeping as anything else. I'm not terribly worried by PC poison use, although I do impose limits. This is one.
Magic Arrows. With few exceptions, magic arrows are one shot in my game. That's how I justify the steep, steep price break on them. I'd make allowances for a special arrow, that somehow survives multiple uses, and indestructible arrows that don't use up their magic in a single hit would be fine with me. So the arrow may survive, but the magic does not.
You could add a perk, too, for those who really want to get their arrows back:
Thrifty Hunter*. A leveled perk, capping out at 2 levels. This gives a +1 to the odds of recovering an arrow; maximum is still 5 in 6.
Those may help your scouts save a bit of lucre on their ammunition costs, and get some of those fine balanced silver-coated arrows back after the fight.