In the upper left, we have a quadrate. This bone is a link between the mandible (lower jaw) and the skull proper. The jaw articulates on the lower end of the quadrate. Then below it, lower left, is a possible fragment of skull, perhaps back by the quadrate. In the center we have most of the interclavicle (breastbone on humans). Finally, on the right is what I think is a thoracic rib (from the throat area). It has very unusual grooves in it.
So I really don't know what's going on - sexual dimorphism? Age differences?
Anyway, they are soon to go up to Alaska.
Sincerely, Greg Carr