Okay you gotta give us some details! Lol
lots of folks took the time to reply, and apparently provide info you already knew...
...so give us some details and or pics of the box, the coop or something...
otherwise we get frustrated that you’re not helping us helping you and we start rooting for the critter to win
For starters let’s see a pic of the rat trap.. or tell us at least is it the yellow pan type or the wire trigger type?
... and which way is it facing in the weasel box?
Have traps ever been tripped or just robbed?
Gotta trail camera you can put out?
If not can you make a little “track bed” of smoothed out dirt or a dusting of flour to catch its tracks as it comes and goes?
Hang in there this critter ain’t magic, you can get it!