Grrrr. what a way to start my day off.

I walked in my office @ 7:30am (30mins before my shift starts) Laptop bag in one hand and a hot coffee in my mouth as I try to unlock my door with my free hand.
What do I hear out of the background, a person complaining that his system time is out by 25mins. I already knew this as I told him last week to put a ticket in for this (we can't do anything without a ticket) He says loud enough for me to hear "so and so still hasn't fixed the time on my computer from last week, all he does is sit in his office all day on his laptop"
This really irked me more than usually. Maybe because it was still early or I was still trying to drink my coffee to wake up.
So after mumbling some choice words under my breath I checked my laptop incase I may have overlooked the ticket and nope, no ticket. So I've told him again to put a ticket in for it to be fixed.
I have noticed that since I have an office and 95% of my job can be remotely that other employees don't think I do anything. I've heard this before "That's the IT guy's office, he just sits there all day."
So can anyone give some advice on how to look busy? lol.