for this method, you'll be taking advantage of some of the characteristics of the site. For "legitimate" buyers the website already offers so much, but if you figure out how to take advantage of the system (which I have) you can easily make it a source of free stuff.

One of the main disadvantages of AliExpress is that the shipping is often extremely slow unless you pay extra, and the tracking doesn't even work most of the time. But wait a minute, the tracking is not only used by the customer but also as proof of whether or not a product has arrived yet! So this method will basically be you looking for stuff that has broken tracking and then just claim it never arrived.

To go into more detail about how to properly do it (because from only what I said above you could make mistakes), you need to be relatively certain that a product doesn't have any tracking. One good way to do this is to check out the feedbacks: many people will put stuff like "track is not tracked" or "tracking not work" in their feedback. While most of the people on AE don't know much about grammar, they still provide some extremely useful information for us since you can see in the feedbacks what shipping method they used. So if you use the same as someone who said the track does not work, you will be almost completely certain you can do this method with it.

Another method of finding items is to simply remember what shipping methods have good tracking and which ones don't. This is really where experience with the method comes in: after a while you'll just be able to scroll through the products and not even have to look at feedbacks anymore, but in the beginning you will have to read through many feedbacks to find some items with no tracking.

Then, another important thing is to know when to open a dispute. AliExpress sellers hate disputes and for good reason. So you need to SE them a little to get them to cooperate with your free shopping frenzy. Tell them it's a gift for a friend's birthday and you need to get it very soon, and that you're not entirely familiar with the website so you're worried when the shipping takes so long. They'll of course apologize and tell you to wait until your buyer protection time is about to end, because for some reason the on-time delivery takes as long as the buyer protection time. About 10-15 days before it ends, request for the buyer protection time to be extended. If you have a friendly seller he will do this for you, if not you can immediately open the dispute.

If the tracking is broken, they can't prove whether or not you actually got it so even if the seller doesn't cooperate you should be able to get AliExpress to intervene and give you your refund.