Out of curiosity, I checked to make certain someone hadn't superglued the lid shut. Seeing this wasn't the case, the services below came to mind 'the note leaver' may have been alluding to:
Shoe shine service
Book cart service
Last minute gift shopping
Manicure
Oil change (filter extra)
Annulments
Ikea furniture assembly hotline
The Rockettes ticket order service (Special guest: U2)
Meals On Wheels
P.S. Later in the day, the sign was changed to 'service' (singular) and switched to another stall.