Greetings to a fellow fan of The Monkees!
I wrote to Peter last year and sent him a blurry picture of my record album (only thing I had at the time). He did sign it and sent me a modern postcard like autographed pic too.

Took about a month. But I want to resend with a nice pic later.
I sent the same thing to Davey last year and he too replied.
Was getting ready to write Mike & Micky, but with the saddening and untimely passing of Davey, decided to hold off for a while, to give them grieving time.
I wish you well with your request!