As chips are naturally curious anything will entertain them for a while try throwing in an odd worn trainer the smell won't bother them but hey will bury seeds under the tongue and rip out the inner lining for their nest.
Toilet tubes and paper towel tubes are always welcome especially if they are filled with hay and nuts...old margarine tubs/pot noodle tubs with holes cut through the corners or just go gathering in you neighbours gardens, rose cuttings are good for them as they will eat the dying petals and chew the bark off the branches,tubing of any sort for them to run through I have an old tumble dryer flexi-tube hung from the roof and they love it.
