Here is the gist of it with no names and such.
"It has come to our attention that a recent lot of Best Pils Malt is contaminated with Best Acidulated Malt.
We are contacting all customers that have received bags from the lot in question which is easily identified by "GWP0017523 XXXX 532301 P3.5" on the bag. XXXX would be the sequential bag number from the packaging run. Unfortunately, we are unsure of the extent of the problem and specifically which bags in the run have been compromised. The product you received may be completely 100% Best Pils malt and just fine."