Hi!
You have either to be or get very lucky to find those Bosch T-Loc Systainers - as far as I know they were never really sold/delivered in anyway so there is really a lot of luck involved in finding them and you definitely can't simply buy them like stock items.
--
If I had to guess,
and this is pure speculation: Most people might know that Bosch and Tanos were having a lawsuit over patent infringements that had to do with the whole L-Boxx vs. Systainer thing (This is a fact for all I know). Since new products are not introduced to the market over night I guess Tanos delivered "Prototypes"/"pre-production"-models (or whatever you want to call them) to Bosch for testing and evaluation purposes - then everything went south, they parted ways and there was this one delivery of X, XX or maybe XXX T-Loc Systainers in Bosch Design.
--
Whatever happened to the majority of them or not - a couple obviously somehow hit the market and were obtained by HIGW65 (the Youtuber who's video you shared) who is very well respected within the German Bosch Professional Forum and has an unbelievable wealth of knowledge about everything Bosch Professional and tool usage.
When I was active in that community he helped me to obtain a couple of "Bosch Professional items" that are highly sought after by many but were never officially sold or available for ordering but were promotional items of the past - I will be forever thankful for that.
So my advise would be to search ebay and platforms the like by day and night, never stopping, crawling through the web (and maybe even the dark web [scared] [eek] [blink]

).
I wish you the best of luck with your search - I would like one myself but came up with zero to this day.
Kind regards,
Oliver