I have had the same thing happen over and over in the past,,,,,, I learned that the otter will be captured were he wants,,lol.(even moving the cage one foot)................
In area without sufficient food source the otter move great distances...worse then a cat
Once they;;;; (I say they because it is very rare in my short experience to have a single otter,,,, Even the males move in waves...) find a food source it can be quickly cleaned out,,
Otter eat fresh food..
Sometimes a gland lure like asa lenons super all call helps,,,,(or any of Aces's products,,,,,,,they are top notch! and he is a heck of nice guy,,,,)