Are you unable to catch your rat? Sometimes rats need a little encouragement to get into a trap.
Sometimes you know there are rats about because you can hear them, see them, or see their faeces, but they won’t take any bait or enter your trap.
This might be because the rats are unaware of the bait inside, because they’re being cautious about the new boxy shape in their environment, or because they can smell human scent on the trap.
Regardless of the reason, some people have found that adding some attractive bait outside the trap, perhaps with a smear leading inside, will attract rats into it. This may take a few days to happen, but eventually you’ll be successful.