I had 6 weeks of annual leave saved up. Im changing to a job that pays significantly more than my current salary. When my boss asked me what it would take to stay, I asked for a salary increase of 35% which he begrudingly gave me. Then I quit. This equated to an entitlement payout of about $10,700 instead of $8000 on my previous rate, an extra $2700. And the new job still pays more than the increased rate I asked for.
They do have a way to check, and they always do for higher level jobs. Most great jobs include a 2-4 week background check period where they verify literally everything you’ve told them and some things you haven’t told them.