Gmail is deleting recent spams automatically

I don't know how many of you are actually paying attention to your Spam List in gmail, though spams are not to given attention. I posted about gmail spams yesterday and doubted myself about the automatic deletion of spams. Now I have confirmed that spams are infact being erased without your consent and before getting 30 days old (as gmail claims). In the morning I noticed that there were 3 spams and now at 8:52PM, there are none except those of October. Is it that gmail mistook recent spams as 30 days old? Or gmail spam detection is getting so powerful that it can detect and delete even after getting to your spam list? But why only the recent ones? :-0

I have not deleted spams since Oct 26.

GMail spams surprised me

I was quite used to delete gmail spams every hour or so. Later I thought how come google didn't do anything to reduce the spams ( i was getting very few in hotmail 3/4 per day at max). I decided to gauge the gmail spams and not to delete any spams from Oct 26, 2006. I wonder if google knows about my plan but 5 days after I started, the spam decreased to 1 per day. I don't know whether I mis-seen, but I felt that I have seen 3 spams on Oct 31 but later there was only one. Well google wouldn't delete fresh spams automatically. Maybe my mistake.

Here's the 6 days result

Oct 26: 16
Oct 27: 13
Oct 28: 13
Oct 29: 9
Oct 30: 15
Oct 31: 1 (this one really surprised me)

I will continue for entire November month. That will be a better measure.