Found some correspondence between Tesla, George Scherff and JP Morgan. Microfiche, hard to read, but availabile.

https://drive.google.com/drive/folders/0B70OHRF13ajnfmJ6N3k0OE9NTjlQNktvSW92cEZQUFZWYkR1U1kwZTV3S1NuVkxxZkptVlU