Bike locks used to secure were a Kryptonite Bike Lock & Flex Cable and an Abus lock with a longer Flex cable.

The Kryptonite lock was through the hole in the frame and the long cable was routed from the seat of the Raleigh Shopper bike through the metal shelving unit and then through wheels and frame.  My Milano roadbike was secured to the Raleigh Shopper with the Abus locked through the Kryptonite lock and the Kryptonite flex was routed from the Abus lock through the front and rear wheels and back to the Abus lock.

Since there were no bits of Flex or locks left, I believe they have cut the flex which attached the bikes to the shelving unit and carried out both bikes attached to each other.  I naively thought that would be dissuade a bike thief from wanting to steal the bikes but it appears I was very wrong!   I can only believe they were stealing an expensive bike and it would be worth the effort.