HERE is a good reason to spend the Easter weekend rummaging through the attic or the garden shed or even looking under the bed. Anyone who unearths an authentic chamberpot from London's famous Ritz Hotel - emblazoned with its distinctive coat of arms - can turn it in personally to the hotel's general manager, Mr Radha Arora, when he visits Hongkong next month. Such is Mr Arora's anxiety to get his hands on some of these bone china receptacles that he is offering GBP1,000 (HK$11,770) for every one returned in good condition - and there are believed to be quite a few ''inadvertently relocated'' in this town. (Bet somewhere in the back streets of Shamshuipo some poor potter will be getting an unusual request any day now!) The 35-year-old Mr Arora is the first non-European to hold the position of general manager at the Ritz - and also the youngest. During his visit, Mr Aurora plans to recruit Cantonese-speaking staff to provide for the needs of the increasing number of guests from Hongkong at his hotel.