Recover from recycle bin in macOS - "$RECYCLE.BIN" folder

[sr21ffs]

I am using FreeFileSync in macOS. I wanted to mirror the contents of a USB drive in a folder in my Mac but, by mistake, I did the opposite (mirror the contents of the folder in the Mac into the USB drive). It is strange because I have been using this to sync files for quite a while, but at some point it seems that I mistakenly changed the direction of synchronization errors and the configuration was saved like that.

Fortunately, I had the recycle bin activated to capture the deleted files. However, I cannot see the recycle bin in the macOS system as part of the general recycle bin. What I see is a folder in the UBS drive with name "$RECYCLE.BIN" and that contains the deleted files but with the names changed (and also some .sqlite files that I guess contain metadata for the recycle bin). I clicked on some of these files and I can actually see their contents, but those files do not appear if I click on the "Trash" icon on my Mac. How can I retrieve the files from there, using the Mac?

Also, as a caution measure, is there any way to activate a warning if a considerable number of files is going to be deleted during a synchronization?

Thank you very much in advance for any suggestion.

[therube]

(I know nothing of Mac.)

"$RECYCLE.BIN" sounds like Windows.
Seemingly /.Trash/ is Mac?

https://www.howtogeek.com/733689/where-is-the-recycle-bin-on-a-mac/
https://news.trendmicro.com/2023/11/14/trash-folder-on-mac/

I see is a folder in the UBS drive

The USB drive is formatted, how? NTFS or exFAT? Or?

with the names changed

Expected (in Windows, except where an entire directory was deleted).

also some .sqlite files that I guess contain metadata for the recycle bin

Most likely they're just .sqlite files (& nothing to do with recycle bin).