Bereft of a budgie

Sadly, one of our budgies flew the coop on just the third day of his stay with us. Earl, the one lurking in the background in the picture below, shot out of the cage and out an open transom and we have not seen him since. But this was just after what was meant to be the fourth budgie was introduced to the cage. He is Huey, a yellow-green with grey factor (I think). Apart from that, the budgies are fine. I got Sanjay to come right up close to my hand, holding a millet spray, inside the cage. Pearl is quite wary of me, though, and the new guy, Huey, is somewhat subdued. His head is so fluffy it is hard to tell when his eyes are open. A lot of my Google activity the last few days, apart from trying to find a sports bra to replace the one that's missing, has to do with budgie behaviour and care. I will post more pics soon. The news from the outside world has mostly been too dreadful to comment on.