Rosella outside nesting hollow

yellow rosella
Leaving work last week and I heard an unusual birdcall. 

Spotted a yellow rosella siting in a tree. 

When he called again, his mate emerged from this hollow and they flew off together. 

So I got excited when returning to work this week to hear the same birdcall and spot the same bird. I had my camera and it had my zoom lens. 

However, the rosella was less excited to see me and mutely sat on the branch. 

I heard the birdcall again after I got inside and watched them fly away while looking through the office window. 

Going to need to improve my stealth skills to get the photo I want of her emerging from their nest.