US lumber prices are falling back to Earth. Prices have dropped from record highs, spurred by the economic reopening and potentially pointing to an eventual return to normalcy  Futures for July delivery ended Tuesday at $1,009.90 per thousand board feet, down 41% from the record of $1,711.20 reached in early May. Futures have declined 14 of the past 16 trading days.   Cash lumber prices are also crashing. Pricing service Random Lengths said Friday that its framing composite index, which tracks on-the-spot sales, dropped $122 to $1,324, its biggest ...