Every 5 days, if nedessary, the LEAF will recharge the 12v battery (from the traction battery), and a small variation in estimated SOC can "drop" a bar, making it look like more charge has been lost than actually has been used.
Also, there must be a fair amount of electronics still "ON" in the car to measure cell voltages, calculate SOC, use the CAN buss, and talk/listen to CARWINGS.
Where is the RFID, inside an unlocked car, or ... ? Maybe that and the security system take extra power?
Did you record the mileage when you "gave" the car to them?
This is one example of where the Watt-Hours-Used meter would accurately tell the "real" story.
But, since things are stable now, it is looking good.
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
Solar PV: 33 x 225W -> 7 kW max AC
Craigslist: Xm5000Li Electric Motorcycle