Polyphemus in Switzerland

I have been sorting through some papers and came across a picture of this fine Roman comb showing the blinding of Polyphemus and possibly Meleager on the reverse. The comb was apparently part of a grave group that contained other ivory objects, a glass phiale and an agate amphoriskos with silver adornment. 

The group surfaced in Switzerland.

Where was the grave found? What other objects were in the group?