Lockboxes

Ive been wondering my lockbox keys are racked up over time I've got atleast 25-30

, Ive been deciding taking 5 at a time as thief with purple/gold backpack. Due to solo games not having rooks join Mid-game. Do people hide in bushes till the 10min mark then move on say dire-marsh to fill on lock boxes? As it makes sense due to the longer a game has progressed the less players you will encounter.

Or just go for it and hope for the best