LME copper may retrace toward $5,900-6,000 in short-term as market overbought after last week's rally, though medium-term uptrend intact, says trader at Japan house; 3-month copper down $10 on London PM kerb at $6,270/ton, after slight losses in overnight trade despite drop in LME stocks. Trader says as RSI is above 70 at 75.8, may be good time for profit-taking; still, uptrend to resume before long as China, Taiwan consumers looking to buy aggressively, LME copper likely to then rally toward $6,500.