They've only recently celebrated their 20th anniversary of North America presence (Emerald Edition tools in 2019), and the company itself is over 90 years old (2015 was the 90th anniversary), but the Festool brand name didn't come into existence until 2000, and Systainers didn't come into existence until 1983. T-Loc started in 2012.
Maybe it was a 2013 model that someone decided to stuff some styrofoam into a bunch of leftover "classic" Systainers? The cooltainer still has "Tanos" molded into the lid...