The machine, one of two available for hire, had been placed in the cupboard as staff were waiting for replacement parts for it to arrive.
"It won't go."
Mr Knox said the intruder ignored games and movies as well as two charity collection money boxes on the counter in favour of grabbing the machine.
He had been alerted to the break-in by a security company as he lived nearby and was on site "in about six minutes".
He believed the alarms that activated might have caused the burglar to quickly grab what he could and get out.
He was caught on camera surveillance although he was well covered up.
Police were examining the footage.
Eighteen months ago the store was targeted by a knife-wielding robber who walked in at closing time around 10pm and demanded money.
He made off with only a small amount of "float" cash in the till.