The grip safety on the 40 can be pinned down. Make sure the gun is unloaded. Remove the stocks, there is a hole in the front part of the safety and in the grip frame that line up when the safety is engaged. The pin is in the frame, look for it.
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Very nice revolvers, but you are older than those guns. Bangor Punta owned S&W from the mid 1960’s to the mid 1980’s, Your boxes are so marked. The Standard Catalog of Smith & Wesson lists DOM serial number ranges which could tell you when each was produced. A factory letter (quite costly) would give a shipping date and name of who or where it was shipped to.
Beautiful examples of new in the box guns. A quick glance at the Standard Catalog of Smith and Wesson gives the following serial number info:
Model 40 falls in the 1971 to 74 range
Model 60 falls in the 1974 to 77 range
Model 66 from 1964.