I think the meme of lazy/incompetent/wasteful government workers is so pervasive that people will simply not to ask, "Is there a good reason for this?"
Ayup. Some years ago I held a government credit card as part of my job (so I could pay for minor purchases needed by my office, stuff like stationery or batteries). As part of the training I had to do to qualify to hold it, we were told that not only did we have to be honest, we had to appear
honest; we had to think, hard, about what a purchase record might look like to someone who didn't have any background information. All the credit card accounts got sent to a particular office and audited randomly every year, so there was a good chance of someone jumping to conclusions if you weren't careful.
A minor example of 'making sure things look okay' that got suggested: when buying supplies for conferences, items like biscuits and snack food should be ordered at the same time and from the same supplier as the other conference supplies, so they'd appear on the same receipt and look less like we were financing our morning teas with government money. (I have to say, that one didn't work very well; when a guy from one of the areas we looked after got hold of a delivery invoice that had biscuits on it, he spent about twenty minutes interrogating me about why we'd bought them, whether or not it was legitimate, and whether or not he should report me for peculation and fraud. This was the same guy who kept trying to get me to buy things for his office without doing the proper paperwork and getting approval first, so it's not like he had the moral high ground or anything...
More serious examples of legitimate purchases that had gotten people into trouble:
Flowers, close to Mother's Day. What the auditors didn't take into account was that the credit card holders were military personnel, and they'd bought wreaths to lay at memorials on ANZAC Day (around two weeks before Mother's Day here).
Video copying charges, from a... ahem... purveyor of adult entertainment. Despite appearances, the cardholder in question hadn't been picking up a few copies of his favourite naughty nurse videos; he'd been at an air show, there'd been a crash, and he'd found someone in the crowd who'd been filming in the right direction at the right time. He needed several copies to send to the accident investigation team etc., and since it was late afternoon on a Sunday, the only place he could find open was in the red-light district. Perfectly legitimate, but MAN it looked bad!