...and if OP was able to find hermit crabs or some other type of crab not listed in the "Shellfish - Species and Limits Table", he can retain 4 in all Areas in BC including Areas 28/29 (Lower Mainland) with a tidal license.
http://www.pac.dfo-mpo.gc.ca/fm-gp/r...quille-eng.htm
"Crab, Other
Area 1 to 29 Limit: 4 Apr 1 - Mar 31"