The choice of the foundation as a beneficiary was down to the monstrous Maitre Suzanne Blum, who had connections with it and who was officially an indirect beneficiary herself (we all know that unofficially she grabbed what she could and abused the Duchess). The late Duchess of Windsor probably was never aware of it and had already told long-time employees they'd be in her will. Not with Maitre Blum's claws into Wallis...

The jewels are magnificent, though.