Contents stiil show up in trash

When I use my flashdrive on my mac contents that I thought I deleted still show up in the trash. When I go to empty thetrash it says I have 3,000 plus items to delete. Where is this being stored?

Thanks

You have to empty the Trash while the device is still connected.

By the way, is there a way to delete the files directly without having them sent to trash first?

With Windows holding the Shift key when selecting Delete works.  Not sure about other OSs.