From Law 1:
Flagposts A flagpost, not less than 1.5 m (5 ft) high, with a non-pointed top and a flag must be placed at each corner. Flagposts may also be placed at each end of the halfway line, not less than 1 m (1 yd) outside the touch line.
So the answer don't start until they find them. If they cannot find them , then play the game and report them to the league. The Home team will quickly realise that it is cheaper to buy their own than pay the fines...