Secretary desk with secret compartment - How to open??

I have my mothers secretary desk. She once showed me a secret compartment and I had forgotton about it until recently, There are 2 holes, one each side when you open or remove the top drawer. Seems similar to device described by Lynn Wilkins. There were 2 devices about 2 inches long. one end went in the hole, the other end was pushed in to secure it. There was a small metal part that had to be down when the device was inserted. Starting on the left, it was turned forward until you heard a click. then repeat the same process the other side. A hidden draw then popped forward. It was between the top drawer and the desk lid. When the plungers were removed the draw could be slid back. I remember commenting at the time that if you didn’t know it was there you would never find it. the devices are lost and I would love to hear from anyone who has anything similar.
It has now become almost an obsession trying to figure out how to open it.