Dear {Name}
I’m so sorry I accidentally took your {lunch/office supply/phone charger/coffee mug/etc.}. I mistook it for my own, which looks similar.
I hope it wasn’t too inconvenient to {humorous comment if appropriate}. I’d like to make it up to you by {taking you to lunch/replacing item/etc.}.
Again, I apologize for being such a bonehead!
Sincerely,
{Name}
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Index of letter of apology templates