I found the dang buttons! Where, might you ask?
In my dang button box, that's where. I didn't think I actually put them away where they belonged, because (a) I was knitting the sweater so I expected to use them relatively soon, and (b) I'm not that efficient.
I did actually have a cursory look in the button box a few days ago when the earnest search for them began, but they were in a little plastic sleeve and they'd slid from the top of the button pile.
Now they're sewed onto the front of my sweater (can't see 'em in this photo - oh well - ) and I truly have a Finished Object! It's warm and cozy and smells of lavender Eucalan. I blocked the sleeves a little too long, but I'm prone to doing that after years of the bracelet-sleeve look in store-bought tops because of my long monkey arms.
Good thing it's done, too. The temperature is going to drop like a rock in the next few days. The Sideways Sweater - just right for a walk in the neighborhood, or raking leaves (there will be a whole lot of them soon) or an emergency trip to the store for milk for the morning coffee.