Google sheet documents opened by them selves and all have resetted 'created date'

When I logged into my Google Sheets account, I saw that earlier that week, a great number of my Google Sheet documents had been opened (about 30). It was logged as though they were opened by me. I had, with 100% certainty, not opened them.

What is worrisome is that the sheets all contained financial information about the company that I work for.

After having reset the Google password and having asked colleagues if they had by any chance used my computer to log into the Google Sheets account (and was assured this was not the case), I did some further research. After opening one of the sheets that had been mysteriously opened, and checking the details, I noticed that the date on which the file was created, was set on that same day it was (mysteriously) opened. The documents were in fact much older though, some over 4 years old. I also checked documents that were not opened that day and they still had the original creation date.

My question is: Is it a familiar phenomenon that Google Sheets sometimes appear to have been opened by themselves (because of a bug at Google) and have a reset creation date? If yes, I'm greatly relieved. If not, I'm worried that my account was compromised in order to illegally obtain financial data from our company.

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