There are other possible ways to word the note --if you consider that it offers useful information to catalogers and/or other catalog users in the future. If not, do not give a note.
Might a researcher in the year 2045, for example, find such information to be of some value?
No ending punctuation
Dates of publication: Example 2 
008 DtSt: c Dates: 199u,9999
260 [St. Paul, MN] : ‡b University of Minnesota
362 1_ Began between 1990 and 1992.