I totally understand how finding that magnifier could be such a high point. Best thing I've read so far today! (It's early but I'm serious. )
It was very satisfying to find it. I wasn't actually sure where I'd lost it, but I guessed it was when I got caught up in some thorns and cut my map reading hand. I remembered where that'd happened (roughly). I figured if I walked the leg, I'd have a chance of finding the spot. And it worked. I walked directly to within 1.5 meters of where the magnifier sat. It felt like spiking a control on a tricky night leg.