Edit: I misread the initial post, but still think what I wrote is reasonably relevant. Had I been Satoshi (and I'm not), I would have no trouble not talking about it.

I think this is unlikely. I think it is much more likely that he deleted his keys -- on purpose. Despite the common "Bitcoin was created as a scam" sentiment, I see very little evidence of this. Satoshi appears to have just been a very idealistic person who thought that he was doing something useful. From the beginning he said that he shouldn't hang on to those initial coins because it would undermine the validity of the currency. Out of curiosity I've read through a fair amount of the original dev forum archives (I forget where they are, but I'm sure they are not hard to find -- last time I looked I found them right away). As far as I can tell, it is what it appears to be. Which is not, of course, to say that there aren't plenty of scammers in the Bitcoin world. It just seems that Satoshi wasn't one of them.