I would say that buffers would be a relatively common accessory in peoples gardens etc - but you would be amazed at what people have stashed away on their homes be it buffers, piston heads, crossheads, connecting rods, pressure gauges, smokebox darts, droplights, compete railcar driving cabs, seats, etc etc
A friend of mine has found an EE 450 class piston to be ideal for holding the door open for instance!