This mat thing is all over the place. Brand new mats just say Model designation in Stamp, while some models come with the silver bits.
Oddly my boot mat (also BMW) has the silver thing, but the floor mats in the car dont.
I am realizing now that there is no standard and potentially while there are different part numbers, based on availability locally/at the factory, the part numbers are circular (ie they point to each other when one isnt in stock).
This means weeks apart, placing the same order and using the same part number can get you different mats depending on local/international availability. Unless someone tells me otherwise.
I tried ordering floor Liners for my car (which btw have a different part number), and was told in SA theres only one partnumber even though according to BMW there are allweather mats AND allweather LINERS (the liners being the one with the raised lips for snow repellancy).