The relevant point is that the willingness depended on the employees veiw that the search was legit, because the reason was for drugs. They claim, they thought their firearms were fine where they were.
Bait and Switch. Isn't that illegal? ;-)
If you willingly allow police officers into your house because they are looking for illegal drugs, and you KNOW that they will not find any, but during search they find child pornography in your house, will your defense be that the pornography was seized illegally because you did not express willingness to allow a search for the porn?