NO 'extras', 'overruns', 'duplicates' of these were made, as the film companies would not license Carta Mundi/GPI to do so.
(Same applies to the $5k, $25k & $100k chips)

300 plaques (150 each denom) which makes up almost all that were made and used on set, were, following filming, put one each in 300LE boxed pair of diecar motor cars.
The diecar cars sold for fixed price £250 ($480) with the plaque.
The same non LE car set with no plaque sold for £70 ($135).

Bond car collectors have thus paid $345 for the plaque.

That said, its not the 1st on ebay and it wont be the last. One already sold for £750 ($1450)