There's a good chance it was just left there on the ground for whatever reason & the trolley guy simply drove off & never saw it again! Happens ALL the time at any airport, just this time someone hit the panick button & the rest is typical hysteria!
I used to work at Tulla (in the oil industry) years ago now & saw so many 'sus' packages on the ground & around an A/C left unattended that almost nobody bothered about then 'till someone all but ran over them, that was 'till 9/11, after that even an M/T cigarette packet was 'sus' !
CW
CW