Sorry I don't have any more info on this auction. Like I stated in my first post, this is a collector who purchased this costume piece from some auction in Canada. He had stated that the "head" was about 30 years old. I'm thinking this may have been part of a costume form a stage show or ice capades type show, not one of the "park" Mickey heads.
The Disney "Secret Police" will be knocking on this guys door any minute now. Disney protects it's charachters more than anything else so it is very unlikely that they know about this particular auction piece.