Right, however to avoid other users trying to claim the wallet you'd have to be as vague as possible, and ask questions that realistically only the person that lost it would know. Even then, you probably can't verify it to the point that there's no doubt in your mind that someone owns it. I guess it depends on how it's find, and if there's any accompanying information with it, but thinking of the worse case scenario it could still be rather difficult to prove beyond a shadow of doubt that someone owns it. If they don't use the platforms you use, that just makes it a ton more difficult.

You'd have to be prepared to hold onto the wallet indefinitely, but the question remains are you still making it too difficult for the person who lost it, because you've taken the action of actually taking the wallet (despite being for safe keeping) away from the area that it was lost in.