Its fine Marco, the ESB-a yoda's usually come in long baggies & the seals are genuine, you have a legit & quite nice baggie there, so put your mind at ease mate, here are a few example though just to reassure you buddy.
My 3 -
ESB-a Brown Snake (same as yours)
ESB-a green snake (which has since been removed from that nasty AFA cramped case & re cased BTW)
ESB-a Orange snake
& one that's just popped up on the bay -
http://www.ebay.com.au/itm/290959301550;jsessionid=C6D0FA01C8E07C1D32F6646CC632EABA?ru=http%3A%2F%2Fwww.ebay.com.au%2Fsch%2Fi.html%3F_from%3DR40%26_sacat%3D0%26_nkw%3D290959301550%26_rdc%3D1
Not a LL BTW IMO
Hope that helps Dr D