Yeah, we check those at closing time. As well as behind the mattresses, the bathrooms and anywhere else someone might reasonably hide. There are generally people stocking stuff for 3-4 hours after the store closes and from 5 hours before the store opens in the morning.
There's a small window when the place is completely empty, but it's only from about midnight to 4am.
Mobile elevated work platforms! I prefer MEWP because I can call out "MEWP!" as I point at one and my coworkers can start MEWPing along with me like a clutch of hungry chicks.