Back in the 80's tilled 90's some ADs were not rigorous about matching sets,
and of course they did not anticipate the later phenomenon and obsession of the Rolex full set.
To good guys always pay for the few bad guys...
In the mid 90's it was difficult but doable to get Rolex re-issuing the right certificate
but of course after being abused and to prevent fraudulent market they halted this courtesy.