Check first to see if any Spiders or insects are stuck to the trap. You may want to kill spiders first before dealing with the trap being stuck to something. Same as above.
Unopened packages have a long shelf life in stores.
Once the outer paper is removed the trap will last 3 month, less if it gets filled up with dust. If you have your traps placed in high dust areas such as a work shop, cover them with a box or remove them temporarily until the dust has settled. Same as above. If it is still not catching anything after a week or so chances are you have nothing in the area to catch. Which is good when it comes to the Hobo and Brown Recluse Spiders, since they are strongly attracted to the trap.