I usually lose track of the Belgique just because I smoke it more than my other pipes for all the reasons you stated above. Plus it's light, effortless to clench, good for a quick smoke, or while doing yard work, etc. It's my utility pipe. Also, I got mine cheap. (SP must have accidentally priced it at 50% off because it was only $38 dollars new.) It's my most used and abused pipe for sure. I've burned a lot of Dark Birdseye and Kendal Kentucky in it.By the way, the Peterson Belgique is a nice little pipe. I have the rusticated version, and for a short smoke, or a longer smoke with flake, plug, or rope, and for sampling or testing extra strong tobacco, it's just the ticket. Most pipes are of a size to be misplaced without some attention to them, so I don't think the Belgique is any more loss prone than other pipes. I like a range of sizes in pipes. Each has their purposes.
I can lose things, but my wife is more prone to misplace her address book, glasses, keys, etc., and considers me a pretty good finder. Usually, I'm just helpful, but occasionally I'm pure magician.
Anyway, it'll turn up.