[solved] More than 500?????how could it be?

[Silverthorn]

is there any way I can tell how much hp and mp the milk will recover??

The milk in that trick is not giving you any remarkable amount of hp. It's just that it'll limit your hp to 500 max because that's hardcoded. The actual amount you want to restore has to happen via
an additional object running on state 18 with negative injury etc.