Closing an account after a person dies

I've been searching for an Apple corporate contact point for my question, but I keep running into dead ends. I'm writing instructions for my survivors to tell them what they must do with my digital affairs upon my death. I found the following on Apple's "Legal" page--

No Right of Survivorship

You agree that your Account is non-transferable and that any rights to your Apple ID or Content within your Account terminate upon your death. Upon receipt of a copy of a death certificate your Account may be terminated and all Content within your Account deleted. Contact iCloud Support at www.apple.com/support/icloud for further assistance.

Note that sentence: Upon receipt of a copy of a death certificate ... . How does one send such a document to Apple? Is there a fax number? Does the executor send it by snail-mail to the Cupertino offices? Attention whom? Does the copy need to be notarized? What if the person had two Apple IDs (as I do)--do they need two copies? How much detail does the executor have to provide?

We're talking lawyer stuff here, and I know from experience that legal stuff can get complicated.