Considering the slave/subsistence wages paid by Wal Mart, I wouldn't risk my autonomous vehicle opening itself up to their employees. Who knows what other items might go missing (first aid kit, etc.), and what other "extras" might be deposited (empty fast food wrappers, vomit left over from last nights drink-to-forget-our-jobs-suck bender, snot from omg-I-can't-afford-to-miss-a-day-of-work-if-I'm-sick-they'll-fire-me, etc.)