This sounds as if you believe MAF is just one or two people, who personally have it in for you! - there are about 2000 who work in the organization. Are you expecting a government department to work by simply taking the word of the people it has to deal with? Yes, YOU did clean and treat your property, but anybody could SAY that on their forms, and they don't know you to be able to judge you are honest. They have to have a procedure that will cope with the lazy and the fraudulent, which means the honourable citizens need to go through it, too.
I hope your inspection goes well. It should do when they've started to check, and seen that your belongings truly are clean. But don't give them a hard time on the basis of 1) your crate (it probably wasn't the same officers) or 2) Australian imports (your officials are still there, so they didn't get the sack for that), and you're more likely to get through the day with the minimum of hassle.