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make a nice giftbag, on the outside it could say "happy birthday". fill the inside with travel sized shower gel, deodorant, shampoo, etc. and leave it on his seat on friday afternoon. inside, you can put a note that says "from a friend".
he can look inside, see what it is, leave with it in hand without necessarily knowing that everyone in the office knows what happened. it's also friday afternoon, maybe he'll leave early and nobody will notice. 
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