These are four letters sent from (what seems like) a private owned lab in Mexico to the attention of the company ttokkyo attesting the content of some samples of ttokkyo's products that were sent for content analysis.
Each of these letters basically inform the reader what the sample that was sent to them actually contained. For the record each pill sent to the lab contained a least what they were supposed to contain.
The first letter is of anadrol, the second dball, the third oxandrolone and the last one is of winstrol.
Note: the anadrol, the first letter tested at over 50mg per tab when it is supposed to have 5mg! Check for yourself. It's on the first letter. It might be that I did not see correctly but I don't think so.