Seems i missed this. Try a metal detector. When they raised the old Qualicum train station for restoration a number of years back i found quite a few turn of the century silver coins and a couple rings one Diamond and Emerald 18 k near the old front steps and under the building. Had to crawl a bit but worth it.
Best we did was about $40 in change from the middle school. One of the neater spots was off the Namu cannery in front of china camp. Probably not much left now except the odd bottle.