Straighten the paper clip and slip it inside the binding of an old copy of Britannica I have. I got it second hand from a public library, so it has quite a few of the old style anti-theft tags hidden throughout; it also contains quite a few paper clips of many colors I once used as bookmarks.
I use the remaining time to clean the house, making sure to go into the bathroom more than once, moving the toilet tank lid and opening and shutting all of the cabinets every time. If I’m very lucky I’ll be just shutting the medicine cabinet audibly when the investigators walk in. (For those not familiar, many houses built in the mid 20th century in the US had slots in the back of the medicine cabinet where you were supposed to dispose of used razor blades.)