I know this thread is really old, but I just seached the cash register sound on my Mac and this came up.
My experience is different. I was using the text to speech command on an article I wanted to hear and went to the kitchen for something, but still had my airpods in. I heard a cash register sound and then the mail swoosh sound when I send email. Since I had sent no emails this morning I went to the computer and did a search for any activity today. What came up during that time were 3- .chrono-timeline documents and 1- /ABinfo.abcdi file. I could not open any of them of course, but that last file, I also could not copy. Any idea what these are?
In the last few hours I see different, 4 sets of these chrono-timeline document file at variable intervals, except the ?ABinfo.abcdi file, which are now 2 of, as of just now.
The chrono files start with systemSmall--, systemMedium-- and systemLarge-- variations, and are followed with lots of numbers and some letters.
I don't use google email and don't have Chrome on my computer. I'm using Safari & my Mac OS is 12.6.5.
Any thoughts? Thanks!