Lady Nanazin was perhaps exaggerating a bit when she claimed millions of ropals were lost every year due to unscrupulous folks taking bits out of the coins.
But the practice was indeed widely spread, especially for the coins that were made of solid silver or gold like the intas.
These 'clippers' would use shears and now scissors to cut tiny parts from around the edge of the precious metal coin, so small that at a glance the missing bit might simply be mistaken for the coin being bent or simply eroded through use.
They would also use a tool similar to a nail file to slowly shave away the coin edges, achieving the same effect. The coin might get a bit smaller, but it would be mostly kept to a range that the common eye could not easily tell unless properly examined.
These unscrupulous men would then sell the silver and gold cut pieces and shavings to second hand gold merchants and jewelers for raw cash, thus basically printing money.