Reminds me of a Seinfeld episode when George retrieved a half eaten donut from the trash, and got caught. LOL
First off, don't put things in the trash that you want to keep. If you are unsure about keeping things then create a folder on your desktop in which you can drop them. Later if you decide you want to trash certain items then you have the flexibility to do so.
As a general rule, your desktop is not the most stable place to keep things anyway. Get in the habit of putting files in the right place, ie your Documents folder. Naming conventions are also a good habit so versions of files can be seen at a moments notice, that saves you from putting them in the trash so they don't get confused with a file with the same name, us v1, v2 etc. if you like.
The bottom line is why are you putting things in the trash that you later may want to retrieve? Once you sort that out with one of the above solutions, you won't feel compelled to store things in the trash.
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35 to 4 x 5 - NPS Member