Need more info. Which shop, account age and what's your profit set to on your list
I think the first couple times it was the magic shop, and I tried the battle magic shop too.
Account age would have been 16 or 17 months, or I might have tried a 7 month account once or twice.
And I used a list basically of all the high-end items like r99 morphing potions, 200k+ battle items, etc.
But yeah, I'm not sure if it's working or not. I remember seeing a guide somewhere that said how often certain items restock, like r60-70 items every 1 out of 5 restocks, or r90-93 items every 1 out of 30 restocks, or something like that...