I tried a search from Blogger’s web view. it returned 19 posts, the oldest from 2009. Using other methods it’s easy to find results back to 2003.
I don’t know when this stopped working, but Google turned off its Blog Search a few months ago.
I’ve been running a microblog on WordPress for a few years, but I’d put off migrating my primary blogs. Blogger has been a very reliable service — especially because Google largely leaves it alone. I guess I have to stop putting off the inevitable. This is gonna hurt.