The objects are certainly curious. Their shape and design seems odd for them to be paperweights.
RacingSnake - What material are they made from? Are they aluminium? One would never expect a paperweight to be made from aluminium - and hollowed-out aluminium at that.
Perhaps they were originally solid, and the hollowing-out was later carried out by a machinist, to enable the paperweights to be utilised as tops for the CD tower.
All of the metal BA Concorde pax "gifts" or "souvenirs" I have uncovered, all appear to be sterling silver, with hallmarks to prove their silver standard.