Someplace along the line, no attachment followed.
That said - it's likely a Fraternal sword - Odd Fellows, Masons, Elks, etc - G.F. Foster & Son was a large supplier to those organizations, back in an era when every man belonged to a Lodge of some sort.
It's 'not' military - they weren't suppliers - but could quite easily have belonged to the original owner, if the rifle and sword came from an estate.
Scouts Out!