Documents vanished in Google Sheets

[Microsoft Windows]

There are documents gone in G. Sheets. I did not remove them, I am the only owner. They are not in my bin. I already did a system restore in time. (Windows10). What I did remove was large files in my Gmail, for creating extra space. Is it connected to this action ? How can I retrace these docs ?(P.S. My bin was and is always programmed to not lose documents straight away but for keeping them for 30 days in the bin (where they are not present)

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