The seat mat sensor recall that the OP is referring to was probably issued by the NHSTA in the US. It does appear that many other '06 models have this problem and were not included in the recall based on VIN. Recalls never expire, thus the age of the vehicles and it's mileage does not matter. The OP needs to gather other '06 owners info and formally request the NHSTA to expand the VIN range of the recall. Not much else is going to change anything. Perhaps if you bug BMWNA enough, you will "miraculously" find your VIN in the included range.
'11 X3 xdrive35i
'05 XC70 (family truckster)
'05 Sienna XLE LTD AWD (road tripper)
'06 330i MT, sport,premium (retired)