Out of curiosity, your comment made me fire up the C64 and 1541 I keep as a conversation starter in my office. It still loads the, uh, evaluation copy of Defender of the Crown which 1988 me copied onto a 3M DS,DD floppy in February of that year, if the scrawny handwriting on the label is to be believed.
(I boot it a few times a year, mostly to show younger colleagues that whining about how terribly dated the PS4 is now that the PS5 is (somewhat) available won't get them much sympathy from someone who played games on the C64 in the mid-eighties...)
So, at least one data point for a carelessly stored floppy from a name brand still doing what it is expected to more than a third of a century later!