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My co-worker and I started at the same time, mid-summer, so we each have 9 days of vacation time through the end of the year. Our new boss works remotely and there is very little accountability. My co-worker has started missing a lot of work lately. Sometimes he'll email the team and give some medical excuse (sometimes telling me a different excuse--like just being tired or out with friends), but most of the time, he doesn't send out an email at all, just hopes nobody notices. He's up to 23 days off, but he's not reporting all those days. I talked to my manager about it a couple weeks ago and he said that he was trying to give leniency to this employee because of his medical issues, because he doesn't know that they aren't as valid as he thinks. I feel like I've done all I can do by talking to the manager about it, but it's getting out of hand. He hasn't been to work in a couple weeks, and my manager doesn't seem to care at all. Is there anything else I can do about it?