Based on the date code best guess is 1996, containers are empty but in good condition.
M&M's Plain Milk Chocolate Candy - Case (14.25 LBS)
Mini M&ms Tubes
M&m Singles
Easter M&M's Minis Candy Mini Tubes: 24-Piece Box
Stuff U Crave, Advertising Collectibles
Vintage 2003 M&M's MINIS Tube Candy Container LOT OF 8 ALL SEALED 6”
M&M'S Mini Milk Chocolate M&M's 1.08 oz Tube
M&M'S About Us, M&M'S
M&M's - Wikipedia
Bulk M&Ms Oriental Trading Company