中午出去吃個飯，回來包包不見了！你可能遭遇了“辦公室竊賊”。“辦公室竊賊”常利用企事業單位上、下班時間，以到辦公室找人為由，伺機盜竊。

Office creeper is a person who sneaks into an office building during business hours to steal personal items and equipment.
“辦公室竊賊”指的是在辦公時間偷偷溜進辦公樓偷竊個人物品和設備的竊賊。

Office creepers — thieves who walk into the workplace looking for pricey laptops or purses — are increasingly becoming a problem in the business world. Since laptops became commonplace in the mid-1990s, neatly dressed criminals have found a new crime where they can turn a quick profit.
溜進工作場所偷盜昂貴的筆記本或錢包的“辦公室竊賊”日益成為職場的一大麻煩。自上世紀90年代中期筆記本電腦流行起來之后，穿著安靜整潔的竊賊找到了快速“發財”新的犯罪途徑。

（中國日報網英語點津? yaning）