If you look at the picture showing the side of the inner poly tray you will see that it has been noted with 'Mat.Mus. This is possibly a sample loco from Rivarossi's own original collection/museum, but we don't know for sure.
ATLAS by RIVAROSSI ITALY N GAUGE 54 60 95-40 DB - GREEN BAGGAGE CAR - UNBOXED
RIVAROSSI Italy HO 3515 Furgone F 1264 M C.I.W.L Baggage Coach Express Europeans
RIVAROSSI Italy HO 3523 Letti Lx 3542 INTRAFLUG Express Europeans Coach
Rivarossi Vintage Collection AMTRAK 746 Made In Italy 6554 02 Box Packed Train
RIVAROSSI MODELLO HO-1970-71 CATALOG-96 PAGES-VINTAGE-ITALY
Rivarossi HO 2927 Italy Freight Car Grandes Lignes Type Düm Baggage (U)
