Hey Marcos, I tend to agree with your assessment, however I also agree with Bigmotorssmallcar in that the rivets are newer and not original, so it was off and replaced with this one (possibly the original, but there is a question of whether it is NOT original to the car, anyone can put a couple rivets through some stamped metal). In the attachment, I used a degreaser on the motor bay of my old e3 early on and wiped all my ink off of my original plate. Note the rivets are original on my attachment (much smaller and you don't see the fresh rivet break), but the placement and font of the numbers do look factory BMW on this coupe for sale. However to nitpick even more the coupe has the rivets offset, not even straight holes (one's higher than the other). And of course I had all the other VIN's stamped in engine bay firewall, steering column and original motor on the e3.
The problem is, he should easily be able to find the other VIN locations and take pics. A lot of states require at least (2) VIN locations as I did in Idaho and CA, preferably ones stamped into frame or body, not blank riveted plates that also look cut funny but could be because of the insulation. It would just make the potential new buyer that much more comfortable bidding their hard earned dollars on this car to at least fine one of the other VIN's.
Also, as Bigmotorssmallcar pointed out, I am shocked BaT let that slip through. That is the main reason for pulling auctions is questions regarding the VIN. I see it a lot on trucks like my old '75 Ford "Highboy," many people lift 2wd trucks and say they are original highboys, but once the frame VIN is photographed there is generally no more questions.
If no other VIN verification spots are photographed and uploaded, my guess is they pull this auction until further proof this is in fact the car that is being represented. I wouldn't touch it with a 10' pole until that happens.