Actually I thought some more about this and realised I learned the truth aged 5 from my childhood friend and her Jehovah Witness mum. She too decided to tell her daughter the truth about the gifts origins. Actually JW usually don’t give gifts but this lady was new to it and pretty short lived as a JW as it happens.
So my friend showed me the hidden stash, and then I knew for sure, her mum explained. My parents were pretty sad about it but think they forgave this lady okay as they understood her motivation was good. Actually my mum is friends to this day with her.
So no danger of litigation or hard feelings but it certainly was a test of the friendship the mums had looking back.