Try very lightly dusting the floor of the pantry with some talc to see where it is running from/to...then place traps accordingly.
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Thank you, Shelly....when it ran across the hall, it ran to a part of the house that is being renovated...ie...sheet rock is out, bare studs exposed and bathroom fixtures in the wall are exposed as well as the pipe that runs thru the floor under the house...rat ran to that and went outside...I hope. I stuffed it wth a towel until tomorrow when I get something to cover the hole. So..I am pretty sure the mystery is over, as to how it got in, was getting in and out.