Ive never had to sign for anything from ehobby, back when I ordered from them atleast. I dont deal with them anymore
The majority of the time parcels take anywhere from 7-10 business days to arrive in Canada from China, however in some rare instances parcels can arrive with in days of ordering. This could have been what happened to you, but its only a speculation.
The best you can do is file a complaint with Canada post, and email ehobby about your situation and ask them to keep an eye out for the returning parcel.
"Its only a little bit on fire"