From 2016, model ranges were security marked with VIN Chip stickers which contain the 17 digit VIN number. You’ll find a master window label in the nearside front window’s bottom left hand corner. There’s also a label in the gas locker and then most windows should be applied with a tamper proof window lozenge.
1992 to 2015 Swift caravans carry a 17 digit CRiS number etched onto windows as well as a VIN or chassis number on the A frame or by the door. CRiS numbers begin with ‘SG’.