|If you know you have been there more often and more recently than dropbox security states, and you're naturally concerned as to why "their" records differ from your own knowledge..., (and this concern is reflected in your initial post...; and clearly emphasied in your sibsequent #2) then would it not be wise to run some form of check for possible hacking/intrusion etc.?|
It may simply that "their" security logging isn't up to par, and thus their current records are way out of date?
Short of addressing dropbox support directly... (is that viable/possible?) JohnW's suggestion would seem worth of a try!
As per XpUser... none of us have crystal balls (nor direct access to dropbox or your account); so how can we or anyone else say yes or no - re' have you been hacked.
As regards being asked/advised to download/run one or two utilites... If you were regularly across this forum you would likely have noted that the utilities suggested are regularly applied, when dealing with possible viruses, malware, hacking etc.. All safe and free to apply - otherwise they wouldn't be suggested!
Also Johnw is well versed in "pest control, hacking attacks etc., as is XpUser - and several others here (not responding just now to your post).