Q: Bought Aperture pre-Mac store and lost serial

As the title of this post says, I have been a long time Aperture user (since v1). The thing is, changed computer and did not needed of it until recently. No problem I thought, I will just go back to the apple store, look at my purchase history and get my serial.

The problem is that my purchase is not in the history anymore (bought it too long ago I guess)!

I tried to contact the App Store but they told me they cant help me because I did not buy it in the app store and after spending more than an hour browsing apple site, I could not find how to contact anyone who could help me.

So you guys are my last hope: anyone has an idea how/who I should contact to solve this issue?