I tend to agree with webby. The note will show that you know he did something and that you're watching him. That's enough. If he hasn't done anything, he won't have vandalism to deal and won't be inclined to exact revenge on you. Either way you're wise not to escalate the situation because...
You get out of work because of sleet? Haha... if we get 8 inches of snow, we're just told to leave early in the morning so we're not late getting to work.