They have no definite way to say, "That was an AuctionSniper snipe." There are no AS "fingerprints" on a snipe bid. If you always use the same time interval in placing your bids--last 10 seconds, last 7 seconds, etc. they're going to know that you're using some kind of snipe software because no human being sniping according to a timer can always leave the same interval. In fact, if you want to disguise the fact that you're using snipe software, vary the times of your bids a little bit -- 6 seconds once, then the next bid 8 seconds, and so on.
Why go to all that trouble? If you've read some of my earlier comments you'll know that I'm all about analyzing the opposition by studying habitual characteristics in bidding patterns and intervals. I'm aware that others may be doing that with my bid record. So, I try to vary it as much as possible just to keep from falling into a pattern. It pays to be a little paranoid.