Agreed. Glock used to bring chiefs etc of smaller agencies to Glock Smyrna for “factory tours” which apparently included the Atlanta Gold Club. We are talking about agencies small enough to have single point decision making.
That said 1) things were different in the past and 2) in bigger agencies there are two many people and too much paper trail for things like that to go un noticed.
In fact, the testing for the CBP contact USSS is buying the guns off of was not even conducted by CBP they contracted it out (UL labs ? ) Glock got the contract but SIGs 320 PRO series also passed.
SIG has gotten their hand slapped and some careers have needed due to shenanigans with DHS and the FAMS. that kind of thing does not (did not) go unnoticed at the Fed level.