If it's a touch attack, you'll be scrying the guy's armor or shield. Useful, unless your perpetrator happens to know you use these, and brought disposable armor.

And if you're trying to break into a guild (of any sort), wouldn't you want as much foreknowledge as possible?

Although armor can get expensive, especially if you're minimizing armor check. Though leather armor and a darkwood heavy shield is +4 AC for only 267gp. Definitely not as good as your regular armor, but cheap and easy to get rid of if your armor/shield gets arcane marked. Reusable, too, if you dump it and come back with a wand of dispel magic to get rid of the mark.