It CAN happen at your church. ALL embezzlers were trusted: that’s how they got the money. Even Christ had one bad ‘un in his twelve.
You really do need an audit of your financial procedures. No slam: allchurches do.
We are LOTS cheaper than a CPA audit ($299 – $699, with scholarships for the tiniest churches, vs $3k-10K+).
You will remove temptation, protect reputations, and prevent fraud.
You will also avoid the horrible troubles you would have if you found a trusted member stealing. ANYpastor having gone through this would tell you to hire us.