You are right in thinking that not all were used but yes, some definitely were so "(if any)" isn't quite correct. There isn't a limited supply but there is a limited number of each as BetG confirmed when asked.
The cash desk only had £202,000 in plaques/chips in 1962 and £35000 were sent to the film set. Nobody knows the breakdown of denominations or the serial numbers of the ones sent but the plaques were arranged to be used by Terence Young. I just wish there was a list that helped to narrow down which were actually sent or even seen onscreen but, I can dream.
The ones you show are over priced to say the least but a group of £10, £50 and £100 in the same sort of condition sold for £9500 in the lot before the one I showed.
I kept the prices down as much as I could so that the average Bond collector would be able to afford them but as others have listed with large auction houses they seem to have risen in price quite dramatically. I expect the bubble will burst soon enough but only 3 people so far have resold (as far as I know) and most of the fans won't be letting go of theirs in this lifetime as they are have the Pride of place in most of the collections that I know of.