the Houdini called frisco

I was on half day off yesterday - having worked all weekend. Decided to do housekeeping, which also means, moving some pieces of furniture. My colleagues think I'm mad, doing housework on an off-day, but it's what I enjoy.
As I was moving my huge sofa, I heard Frisco squawking in his room. I figured he knew I was home early and wanted out. I didn't bother since the living room was a mess and I didn't want him to get into everything.
When the time came for him to join me, I found him already out of his cage. He probably got out, and spent the night in my luggage, coz he left his feathers there!
Question: How on earth did he escape from his cage? It's not that easy to flip the gate. It has a spring mechanism and the cage was made for parrots....
Well, last night, there was added security for him....no more doing a Houdini....coz Pringles is still hopping about the home, and I don't need any accidents!