If Endpoint does not see it, does the virus exist?

Hi,

So my endpoint misses this virus, but ZoneAlarm (Kaspersky engine) picked it up:

Virus 1 – file name: autorun.inf;  Virus name: Trojan.Win32.AutoRun.gen;  Location: H:\autorun.inf

Virus 2 – file name: winses32.exe; Virus name:  Worm.Win32.AutoRun.gen; Location: H:\RECYCLER\S….etc

Does it matter? Our IT guy said that if Endpoint does not detect it, it cannot be a threat. Is that true? If not, should I report it to Symantec or something? My autoplay is disabled, can this virus still infect my computer from the flashdrive where it is? If it can, how can I search for it, since I only have EP on this computer and EP does not pick it up? Lastly, should I report it to Symantec or something?

Thanks in advance.