hehe
You could take it all apart and engrave the inside. I'm SURE we'd all take it about again to see that.
More to the point, if you engrave on the outside AFTER anodizing, don't you compromise the anodization process. I know we aren't supposed to have leaks, have too much humidity, etc.... but it happens.
I was under the impression that C Systems was anodizing the units, sending them to Dtek, who then rebranded them and sold them (engraving here?) If thats true, I hope its jus a sticker.