A very good local product "The Original Boston Coffee Cake", for whatever production reason, seldom fills in the "best by" date on the box. They had a big display and a sale price near the door at my local Big Y recently. I bought one, even though it was not dated, and as usual, it was very good. As I was digging around looking for a box with a date, several other folks did the same thing. They did not buy.
I was interested as I thought about it later. I went back the next day and watched the display for an hour. The results: 27 people checked for dates and did not buy, 2 bought without checking dates, and 1 checked dates and then bought. I thought it was interesting.