Luckily, we do not have too many suppliers, and as we are pressworkers the majoity rae sheet/coil steel suppliers.
The way we assess the accuracy is that we know the standard quantities ordered for our work (we do have to maintain a certain stock level). Based on the replies, we assess the delivery record for that month. If it was a standard qty and they pin premium freight to it the chances are they are telling porkies.
If, on the other hand, they deliver 100kg against what would normally be 2 tonnes, or if they split the delivery, then the chances are they are correct.
Our suppliers are pretty good. They know why we are asking for the information as many of them are going through similar pains in keeping registrars quiet!
Don