If a small pile of frass is found under an object each time the floor around it is swept, that object probably has an active insect population. Once again, close inspection is sometimes needed to detect these signs. Clothes moths may concentrate on seams and other hidden spots. Subtle skinning of paper occurs as silverfish graze across the surface. You can use your fingers to lightly tap across wood surfaces and listen for differences in sound to reveal hollow areas below, indicating tunneling.
Spiders sometimes take up a position near insect activity to capture strays.
Spiders, centipedes and geckos do not harm objects, and are predators of insects which do. Termites create tunnels through wood as it is consumed by the adults, resulting in serious structural damage. There are no flight holes, as with woodborers, but there is a sand-like frass. Woodboring Beetles including Powderpost and Death Watch Beetles, lay their eggs on wood which is then tunneled through by the larvae, sometimes for years before eventually emerging as adults through small holes. The powderpost beetle generates a very fine talcum powder-like frass.