@perchik -- I guess your theory is possible, although frankly I don't remember talking about cake at that party. We just happened to be seated at the same table with like 6 other people, but we weren't even sitting anywhere near each other. To answer your question -- the cakes have no writing on them. No special message on the cards beyond the normal "Enjoy" or "Hope you like it".
@Cristi -- got a huge laugh out of your policeman on the cake idea. I'll keep that in mind!
@Modern Classic -- good tip on doing a google search on his name. I did a quick search just now... turns out he's got a rather common name, so I'm turning up hits from all over the place (including other countries) for other people with the same name. When I have more time, I'll try wading through the results.
@lilakess -- thanks for sharing your experience. While you have a point about him probably expecting something because he's been sending cake for two years, I don't think he should expect anything from me just because he's been sending me cake. I mean -- if he had been sending me jewelry all this time, you can bet that I'd have called him the first time and rejected it. But since it's cake, it seemed kinda petty to return it when the first one arrived. Also, there's the added complication that I don't even know where he lives so I wouldn't have a way to return the cake without actually calling him -- something I don't want to do in the first place.
@andrew and @segdeha -- like both of you, my friend is really leaning towards the "fallback" idea also. But geez... if that's really the case, then wouldn't I come across as someone really pathetic if he one day asks me out and I said yes? What guy would want to go out with a girl like that?? If he wasn't ready to get involved with someone, then wouldn't it have been better to just stay away until he was prepared to make a move? With the way things stand now, I'd really rather that he just move on, even though I know I've not really given him a fair chance.
@ezraglenn -- the putrid pastry idea has some merit, but I think I wouldn't be able to stand having a rotten thing in my house for four months just on the off-chance that he might send another cake. I mean, that would be like giving this guy so much influence over me, to the point that I'd alter my lifestyle for four months just to make an indirect point. Calling him and talking to him would be preferable to that, I think.