There's no maximum set out in the act or the code. However, in situations where, as you say, it's an exceptional gift, like a $1-million Ferrari, for example, I always have the option of launching an investigation on my own initiative, if I have reason to believe that there's a problem. Even very rich friends don't give each other gifts like that. So I can launch an investigation in truly exceptional cases, such as the gift of a Ferrari, for example. However, the act does not set out any maximum amount.
On January 30th, 2024. See this statement in context.