Slow receipts of inbound inventory with Amazon Prime Trailer

I have shipped inventory into Amazon from overseas. It was picked up from my ocean freight company by an Amazon Prime trailer. I have all the reference numbers but there is no way to track an Amazon prime trailer, that I can see.

It has been 3 weeks since they picked it up and they only received 18 of the 792 that I shipped. I cannot dispute this for another 3 weeks.

Anyone know if there is a delivery scan from these prime trailers or if there is another way that I can see that this actually got to the Amazon FC ? Is there any way I can have them check, earlier than the official investigation date ?