Here is where it WAS:
There are no pets. No sleep walkers. No other adults in the house. No forgotten moments. No wine or xanax. No open window/door. No apartment attached to this room. There is no explaination why the clothes basket had moved. The thing is... this isn't the first time there's been "weird" things to happen in this particular room.
I told my Sister to lightly tape up some dental floss tonight over the doorway and to let me know in the morning what happens.